[TIMOB-19588] Android: Expose color property of ProgressBar

[ashcoding]

Jira: https://jira.appcelerator.org/browse/TIMOB-19588

Test App.js:

var win = Ti.UI.createWindow({backgroundColor: 'white'});

var maxCount = 10;
var minCount = 0;

var pb = Ti.UI.createProgressBar({
    top: 25,
    width: 250,
    min: minCount,
    max: maxCount,
    value: 0
});

var pr = Ti.UI.createProgressBar({
    top: 45,
    width: 250,
    min: minCount,
    max: maxCount,
    value: 0,
    color: 'red'
});

win.addEventListener('click', function(){
    if (pb.value < maxCount) {
        ++pb.value;
        ++pr.value;
    }
});

win.add(pb);
win.add(pr);

win.open();

[ashcoding]

Tap anywhere on the window to make it progress.

[hieupham007]

Code reviewed and functionally tested. Request accepted