[TIMOB-10076] Android: Gradient endPoint property, when unspecified, doesn't adopt its documented default value

Problem

The endPoint property of a Gradient (as seen in the documentation [here](http://docs.appcelerator.com/titanium/2.1/index.html#!/api/Gradient-property-endPoint)) is documented as defaulting to {"y": 1.0, "x": 0.0}. It does not. If left unspecified, the gradient is not applied. Also, setting y to 1.0 (as the same documentation shows) does not work...it must be set to '100%'.

Problem description

Gradient endPoint property does not work as documented and doesn't take the default value properly.

Steps to reproduce

1. Run the following code. The square is solid red. 2. Uncomment the "1st test" line and run again. The box still appears solid red. 3. Now comment back out the "1st test" line, uncomment the "2nd test" line, and run again. Now the box appears with the correct gradient. {panel:title=app.js}

var win1=Ti.UI.createWindow({
                 layout:'vertical',
                 backgroundColor:'gray',
                 exitOnClose:true,
                 navBarHidden:true
               });

var view1=Ti.UI.createView({
                  height:100,
                  width:100,
                  backgroundGradient:{type:'linear',
                                      //endPoint:{ x:0, y:1.0 },    // 1st test
                                      //endPoint:{ x:0, y:'100%' }, // 2nd test
                                      colors:[ {color:'white',
                                                offset:0.0},
                                               {color:'red',
                                                offset:1.0} ]}
                });
win1.add(view1);

win1.open();

{panel}

Expected result

A white-to-red vertical gradient box should appear at the top of the screen, but instead the box is completely red.

Additional notes

Using float values for the parameters never work: setting e.g. y=0.5 shows a completely white box. It works fine if setting is 50%.