Proposal to update build configuration and res attr

[fikr4n]

Hi, it seems that your awesome library is not updated for too long. I tried to open it with Android Studio but failed to build. I updated the configurations –especially the build configuration– in my fork fikr4n:android-FlipView/master.

I use your library in my project and it conflicts with others, so I added fv prefix to the attrs, in fikr4n:android-FlipView/attr-prefix.

Have a look if you're not busy.