Merge pull request #1 from openintents/master

changes in OI filemanager
Update FileManager/src/org/openintents/filemanager/util/ImageUtils.java
Update FileManager/src/org/openintents/filemanager/IntentFilterActivity.java
Update FileManager/src/org/openintents/filemanager/IntentFilterActivity.java
Merge pull request #17 from veniosg/master

Fix for dialog background on pre-holo devices, sort by file extension
Merge pull request #18 from vaibhav3011/master

catch null pointer in IntentFilterActivity, refactoring ImageUtils.