Merge pull request #9 from ffleandro/master

Added OnCompleteListener
fix the disk cache deletion
Merge pull request #10 from snowdream/master

fix the disk cache deletion
Fix of issue #12 and #7 Using a higher sample size will fix problems most likely.
Add purgeable flag to recycle bitmaps when the memory gets full.
Add purgeable flag to recycle bitmaps when the memory gets full.
Merge pull request #13 from vinceve/master

Out of memory exception.
Fix whitespace issue from pull request