add GridViewWithHeaderAndFooter
add GridViewWithHeaderAndFooter in Gradle
add material edittext
add material edit text demo
add RippleBackground
add Ripple Background demo
add Ripple Effect Layout
add PagerSlidingTabPageStrip
add PagerSlidingTabStrip Demo
add MaterialRippleActivity
update Readme
update Readme
Update Chinese tutorial for Gradle Way
Update English Tutorial for Gradle Way
Merge branch 'dev'