modify question to work with add-by-reference, add submit answer reply functionality to ESClient, and test a combined list of questions and answers as topics.
Merge branch 'master' of https://github.com/CMPUT301F14T16/QuestionAppProject

Conflicts:
	EasyA-AndroidTest/src/ca/ualberta/cmput301f14t16/easya/test/SortUpvoteTest.java