work around samsung crashes when creating a thumbnail for a video
Switch to FileCache.
Merge branch 'master' of https://github.com/koush/ion

# By Koushik Dutta
# Via Koushik Dutta
* 'master' of https://github.com/koush/ion:
  Switch to FileCache.
  work around samsung crashes when creating a thumbnail for a video

Conflicts:
	ion/src/com/koushikdutta/ion/FileCacheStore.java