TestSelectorView visual style adapted from HomeScreen
Changed TestTypeButton to use KVO instead of hide badgeLabel
If you add an observer, you should remove it before deallocation or you get a memory leak ;)
Persisted last test result for test type
Merge branch 'master' of https://github.com/rbarbera/irregularverbs

Conflicts:
	IrregularVerbs.xcodeproj/project.pbxproj
	IrregularVerbs/HomeViewController.m
	IrregularVerbs/HomeViewController.xib