[TIMOB-1604] Android: base64 encoding/decoding of Blob cannot be round-tripped successfully

You cannot use Titanium.Utils.base64encode & Titanium.Utils.base64decode successfully to round-trip the encoding / decoding of a blob. In other words, you don't get back the same set of bytes that you originally started with.

Failcase app.js (make sure you have KS_nav_ui.png in your Resources folder; it's there by default with new projects):

var win = Ti.UI.createWindow({fullscreen: true, exitOnClose:true});

var file = Ti.Filesystem.getFile('KS_nav_ui.png');

var blob1 = file.read();
var base64 = Ti.Utils.base64encode(blob1);
var blob2 = Ti.Utils.base64decode(base64);

var thumbnail1 = Titanium.UI.createView({left: 0, top: 0, width: 46, height: 43});
thumbnail1.backgroundImage = 'KS_nav_ui.png'; // the orig, which obviously works    
var thumbnail2 = Titanium.UI.createView({left: 56, top: 0, width: 46, height: 43});
var thumbnail3 = Titanium.UI.createView({left: 112, top: 0, width: 46, height: 43});
win.add(thumbnail1); win.add(thumbnail2); win.add(thumbnail3);

var tempDir = Titanium.Filesystem.createTempDirectory();
tempDir.createDirectory();

// Blob from original file
var file1 = Titanium.Filesystem.getFile(tempDir.nativePath, 'file1.png');
file1.write(blob1);
thumbnail2.backgroundImage = file1.nativePath;

// Base64 encoded-then-decoded blob
var file2 = Titanium.Filesystem.getFile(tempDir.nativePath, 'file2.png');
file2.write(blob2);
thumbnail3.backgroundImage = file2.nativePath;

win.open();

You should see three identical images when that runs. Instead, you'll see only two.