[TIMOB-5043] Make second argument of removeEventListener() optional rather than mandatory (Android and iOS)

var win = Ti.UI.createWindow({
	backgroundColor: '#000',
	exitOnClose:true
});

var button = Ti.UI.createButton({
	title: 'Click to log events!',
	height:80,
	width: 300
});

win.add(button);
win.open();

button.addEventListener('click', function(){
	Ti.API.info('Button click event fired');
	win.fireEvent('testWinEvent');
	Ti.App.fireEvent('testTiAppEvent');
});

win.addEventListener('testWinEvent', function(){
	Ti.API.info('testWinEvent event fired');
});
Ti.App.addEventListener('testTiAppEvent', function(){
	Ti.API.info('testTiAppEvent event fired');
});
win.removeEventListener('testWinEvent'); // this will generate an exception
// win.removeEventListener('testWinEvent', {}); // this will work on android but generate an exception on iOS
// win.removeEventListener('testWinEvent', function(){}); // this will work on both platforms without generating an exception
Ti.App.removeEventListener('testTiAppEvent',function(){});

D/KrollContext(  637): (kroll$1: app://app.js) [117,656] Running evaluated script: file:///android_asset/Resources/app.js
E/KrollMethod(  637): (kroll$1: app://app.js) [168,824] Exception calling kroll method removeEventListener, invocation: null ]
E/KrollMethod(  637): java.lang.IllegalArgumentException: Expected 2 arguments for removeEventListener, got 1
E/KrollMethod(  637): 	at org.appcelerator.kroll.util.KrollBindingUtils.assertRequiredArgs(KrollBindingUtils.java:30)
E/KrollMethod(  637): 	at org.appcelerator.kroll.KrollProxyBindingGen$4.invoke(KrollProxyBindingGen.java:242)
E/KrollMethod(  637): 	at org.appcelerator.kroll.KrollMethod.call(KrollMethod.java:51)
E/KrollMethod(  637): 	at org.mozilla.javascript.Interpreter.interpretLoop(Interpreter.java:1701)
E/KrollMethod(  637): 	at org.mozilla.javascript.Interpreter.interpret(Interpreter.java:854)
E/KrollMethod(  637): 	at org.mozilla.javascript.InterpretedFunction.call(InterpretedFunction.java:164)
E/KrollMethod(  637): 	at org.mozilla.javascript.ContextFactory.doTopCall(ContextFactory.java:426)
E/KrollMethod(  637): 	at org.mozilla.javascript.ScriptRuntime.doTopCall(ScriptRuntime.java:3177)
E/KrollMethod(  637): 	at org.mozilla.javascript.InterpretedFunction.exec(InterpretedFunction.java:175)
E/KrollMethod(  637): 	at org.mozilla.javascript.Context.evaluateReader(Context.java:1142)
E/KrollMethod(  637): 	at org.appcelerator.titanium.kroll.KrollContext$DefaultEvaluator.evaluateFile(KrollContext.java:105)
E/KrollMethod(  637): 	at org.appcelerator.titanium.kroll.KrollContext.evaluateScript(KrollContext.java:306)
E/KrollMethod(  637): 	at org.appcelerator.titanium.kroll.KrollContext.handleEvalFile(KrollContext.java:318)
E/KrollMethod(  637): 	at org.appcelerator.titanium.kroll.KrollContext.handleMessage(KrollContext.java:217)
E/KrollMethod(  637): 	at org.appcelerator.titanium.TiMessageQueue.handleMessage(TiMessageQueue.java:223)
E/KrollMethod(  637): 	at android.os.Handler.dispatchMessage(Handler.java:95)
E/KrollMethod(  637): 	at android.os.Looper.loop(Looper.java:123)
E/KrollMethod(  637): 	at org.appcelerator.titanium.kroll.KrollHandlerThread.run(KrollHandlerThread.java:86)
E/KrollContext(  637): (kroll$1: app://app.js) [17,841] Error evaluating source: Wrapped java.lang.IllegalArgumentException: Expected 2 arguments for removeEventListener, got 1 (file:///android_asset/Resources/app.js#1249)
E/KrollContext(  637): org.mozilla.javascript.WrappedException: Wrapped java.lang.IllegalArgumentException: Expected 2 arguments for removeEventListener, got 1 (file:///android_asset/Resources/app.js#1249)
E/KrollContext(  637): 	at org.mozilla.javascript.Context.throwAsScriptRuntimeEx(Context.java:1786)
E/KrollContext(  637): 	at org.appcelerator.kroll.KrollMethod.call(KrollMethod.java:85)
E/KrollContext(  637): 	at org.mozilla.javascript.Interpreter.interpretLoop(Interpreter.java:1701)
E/KrollContext(  637): 	at script(file:///android_asset/Resources/app.js:1249)
E/KrollContext(  637): 	at org.mozilla.javascript.Interpreter.interpret(Interpreter.java:854)
E/KrollContext(  637): 	at org.mozilla.javascript.InterpretedFunction.call(InterpretedFunction.java:164)
E/KrollContext(  637): 	at org.mozilla.javascript.ContextFactory.doTopCall(ContextFactory.java:426)
E/KrollContext(  637): 	at org.mozilla.javascript.ScriptRuntime.doTopCall(ScriptRuntime.java:3177)
E/KrollContext(  637): 	at org.mozilla.javascript.InterpretedFunction.exec(InterpretedFunction.java:175)
E/KrollContext(  637): 	at org.mozilla.javascript.Context.evaluateReader(Context.java:1142)
E/KrollContext(  637): 	at org.appcelerator.titanium.kroll.KrollContext$DefaultEvaluator.evaluateFile(KrollContext.java:105)
E/KrollContext(  637): 	at org.appcelerator.titanium.kroll.KrollContext.evaluateScript(KrollContext.java:306)
E/KrollContext(  637): 	at org.appcelerator.titanium.kroll.KrollContext.handleEvalFile(KrollContext.java:318)
E/KrollContext(  637): 	at org.appcelerator.titanium.kroll.KrollContext.handleMessage(KrollContext.java:217)
E/KrollContext(  637): 	at org.appcelerator.titanium.TiMessageQueue.handleMessage(TiMessageQueue.java:223)
E/KrollContext(  637): 	at android.os.Handler.dispatchMessage(Handler.java:95)
E/KrollContext(  637): 	at android.os.Looper.loop(Looper.java:123)
E/KrollContext(  637): 	at org.appcelerator.titanium.kroll.KrollHandlerThread.run(KrollHandlerThread.java:86)
E/KrollContext(  637): Caused by: java.lang.IllegalArgumentException: Expected 2 arguments for removeEventListener, got 1
E/KrollContext(  637): 	at org.appcelerator.kroll.util.KrollBindingUtils.assertRequiredArgs(KrollBindingUtils.java:30)
E/KrollContext(  637): 	at org.appcelerator.kroll.KrollProxyBindingGen$4.invoke(KrollProxyBindingGen.java:242)
E/KrollContext(  637): 	at org.appcelerator.kroll.KrollMethod.call(KrollMethod.java:51)
E/KrollContext(  637): 	... 15 more
E/TiJSError(  637): (kroll$1: app://app.js) [20,861] ----- Titanium Javascript Runtime Error -----
E/TiJSError(  637): (kroll$1: app://app.js) [0,861] - In file:///android_asset/Resources/app.js:1249,0
E/TiJSError(  637): (kroll$1: app://app.js) [1,862] - Message: Wrapped java.lang.IllegalArgumentException: Expected 2 arguments for removeEventListener, got 1 (file:///android_asset/Resources/app.js#1249)
E/TiJSError(  637): (kroll$1: app://app.js) [1,863] - Source: null
D/dalvikvm(  637): GC freed 3236 objects / 293944 bytes in 48ms
I/TiRootActivity(  637): (main) [0,0] checkpoint, on root activity resume. context = org.appcelerator.titanium.TiContext@44c3b8e0
W/TiAnalyticsSvc(  637): (Thread-12) [27,27] Analytics Service Started
W/InputManagerService(   53): Starting input on non-focused client com.android.internal.view.IInputMethodClient$Stub$Proxy@44d65ea0 (uid=10030 pid=637)
W/InputManagerService(   53): Client not active, ignoring focus gain of: com.android.internal.view.IInputMethodClient$Stub$Proxy@44d64260
I/TiAnalyticsSvc(  637): (Thread-12) [357,384] Sending 1 analytics events.
I/ActivityManager(   53): Displayed activity com.testing.testing7/.Testing7Activity: 2947 ms (total 2947 ms)
D/dalvikvm(  637): GC freed 7578 objects / 456336 bytes in 57ms
W/TiAnalyticsSvc(  637): (Thread-12) [2161,2545] Stopping Analytics Service
D/dalvikvm(  236): GC freed 43 objects / 2096 bytes in 59ms
D/dalvikvm(   96): GC freed 2327 objects / 135008 bytes in 72ms