bringing in more gitignore for android from

https://github.com/github/gitignore/blob/master/Android.gitignore

plus some extras for mac/linux devs
Merge pull request #5 from cesine/gitignore

suggestion: bringing in more gitignore for android from
Merge branch 'master' of https://github.com/briangriffey/book-animation into viewPagerWithoutDraw