[AC-2853] Progress on XHR file upload return values larger than 0-1

Progress don't work on XHR file upload. Length of image is not added to totalLength and progress value is much more higer than 1 W/InputManagerService( 53): Starting input on non-focused client com.android.internal.view.IInputMethodClient$Stub$Proxy@43b95478 (uid=10004 pid=290) W/TiBaseFile( 270): (kroll$7: app://examples/xhr_fileupload.js) [197,77522] Method is not supported org.appcelerator.titanium.io.TitaniumBlob : size W/TiBaseFile( 270): (kroll$7: app://examples/xhr_fileupload.js) [21,77543] Method is not supported org.appcelerator.titanium.io.TitaniumBlob : size I/ActivityManager( 53): Displayed activity com.appcelerator.titaniuma/org.appcelerator.titanium.TiActivity: 7140 ms (total 7140 ms) D/TiHttpClient( 270): (TiHttpClient-1) [289,77832] adding part message, part type: , len: 12 D/TiHttpClient( 270): (TiHttpClient-1) [11,77843] adding part password, part type: , len: 11 D/TiHttpClient( 270): (TiHttpClient-1) [3,77846] adding part media, part type: image/jpeg, len: 18474 D/dalvikvm( 270): GC freed 11488 objects / 962000 bytes in 127ms D/TiHttpClient( 270): (TiHttpClient-1) [134,77980] adding part username, part type: , len: 14 D/TiHttpClient( 270): (TiHttpClient-1) [3,77983] totalLength=37.0 How to reproduce: run KitchenSink (XHR -> file upload)