Implement ArrayListStack.size()
Implement ArrayListStack.peek()
Change index to indexTop in ArrayListStack.pop()
Write tests for ArrayListStack.push()
Move Javadoc for ArrayListStack's constructor to the appropriate place
Modify Javadoc for ArrayListStackTest.testPush()
Write test for ArrayListStack.pop()
Write an isEmpty method for the Stack interface and its implementation

Format ArrayListStackTest
Write Javadoc for ArrayListStackTest

Also, modify date from 2012 to 2013
Remove println statements from ArrayListStackTest