working on ScrollView for Usage View
Merge branch 'development' of https://github.com/ehis/Liza into development

# By Tony Kieu
# Via Tony Kieu
* 'development' of https://github.com/ehis/Liza:
  Login / Sign Up

Conflicts:
	Liza/Base.lproj/Main.storyboard
Merge branch 'development' of https://github.com/ehis/Liza into development

# By Tony Kieu
# Via Tony Kieu
* 'development' of https://github.com/ehis/Liza:
  sign in logic
getting Challenges from Parse into ChallengesViewController
fixed dashboard ui - not perfect.