added content to birthday-post.md
cleanup mac crap
Merge branch 'master' of https://github.com/caraya/docs

* 'master' of https://github.com/caraya/docs:
  Update hdpi-mediaqueries.md
  Update hdpi-mediaqueries.md
  Update what-ive-learned.md
  fixed fat finger grammar error
  Update hdpi-mediaqueries.md
  Update hdpi-mediaqueries.md
  Update hdpi-mediaqueries.md
  Update hdpi-mediaqueries.md
  Update hdpi-mediaqueries.md
  Update hdpi-mediaqueries.md
  Update hdpi-mediaqueries.md
  Update birthday-post.md
  Update hdpi-mediaqueries.md