improve hotcold
Persistent next button
Merge pull request #13 from itcc-li/sprint2

Sprint2
Merge branch 'sprint2' of https://github.com/Arthur26/hackathon-2014-android.git into sprint2
adjust interface
Add about
layout fix
Merge pull request #14 from itcc-li/sprint2

Sprint2
about fragment added
Merge branch 'sprint2' of https://github.com/Arthur26/hackathon-2014-android.git into sprint2
Merge pull request #38 from Arthur26/sprint2

Sprint2