[TIMOB-24756] Android: Fix ImageView animation task

[garymathews]

• Fix termination of animator thread in ImageView
• This issue has been exposed due to fixing a previous memory leak

TEST CASE

• red.png, green.png, blue.png

var win = Ti.UI.createWindow({backgroundColor: 'gray'}),
    iv = Ti.UI.createImageView({
        duration: 1000,
        images: ['red.png', 'green.png', 'blue.png']
    });

iv.start();

setTimeout(function() {
	win.close();
}, 3000);

win.add(iv);
win.open();

JIRA Ticket

[ypbnv]

CR:Pass

[ssjsamir]

FR Passed: Was able to see the animation of the box switch from red to green to blue. I then saw the application close without any issues.

Test Steps

• Downloaded the SDK Build form this PR
• Created a new Titanium project
• Copied the the test case from description
• Downloaded - red.png, green.png, blue.png
• Added the three images to the resources folder of the application
• Ran the application
• Saw the animation take place and the program closed without any issues

Test Environement
Appcelerator Command-Line Interface, version 6.2.2
Google Nexus 6P (7.1.1)
Operating System Name: Mac OS X El Capitan
Operating System Version: 10.11.6
Node.js Version: 6.10.1
npm: 4.2.8
Xcode: 8.2
Appcelerator Studio: 4.8.1.201612050850