Fix cursor not closed in getFile.
Merge branch 'fix/cursorClose' into fix/cacheCursorClose

Conflicts:
	example/android/src/jp/wizcorp/phonegap/plugin/WizAssets/WizAssetManager.java
Add changes to actual src.
Merge pull request #4 from jrouault/fix/cacheCursorClose

[Fix] Cursor not closed in getFile.