add slideactivity
add slideactivity demo
add patio for take photo
add patio demo
add CreditsRollView
add CreditRollActivity
add ultra-pull to refresh layout
add ObservableView of ui
add ObservableView demo
add UltraPullToRefresh

add UltraPullToRefresh
add UltraPullToRefresh demo
Merge branch 'dev'