Implement delete.
Fix eraser cause runtime exception of negative invalRegion.
tmp check in for record purpose.
Revert "tmp check in for record purpose."

This reverts commit 2c3eb08144d83330f68ef2da769dd08bcea3b2df.
Remove notification bar for easier size calculation.
Change image selection color.
Update gradle and recreate iml. Set sdk source for debug.
Start implement multi gallery. Now AlbumSet is loaded though size is wrong.
gradle update. Isn't it ignored?
Specify size. Remove unused code.
Album Page is now working, anyway.
Update Android Studio.
Factor out some inner class from MultiGalleryActivity.
Implement simple cache engine.
Fix grid view and grid cell size.
Use Exif for jpeg thumbnail decode.
Make load of slide list async.
Implement multi pick. Not good, but work anyway.
Add basic menu and icons. Need to create new icons.