implement getProfileBackgroundColor and getProfileBackgroundImageURL functions in MockUser class for testing the FriendView class.
modify MockUser Class that add a SetProfileImageURL function as a setter.
add testloadImageFromUrlAndScale, testselectImageVersion, testIsNullOrEmpty, testDispose, testCutRoundCorner and testDarkGradually to UtlilsTest class
Merge branch 'test-twitterClient-Utils' into master-test

Conflicts:
	TwitterClient/test/test/hk/ust/cse/TwitterClient/Mocks/MockUser.java