add PictureCast

added PictureCast to projects using Ion
Merge pull request #248 from gweedo767/master

add PictureCast
Merge branch 'master' of https://github.com/koush/ion

# By Nathan Grebowiec
# Via Koushik Dutta (1) and Nathan Grebowiec (1)
* 'master' of https://github.com/koush/ion:
  add PictureCast