delete unused BugSenseHelper;
fix url path/toString bug in LoaderTask;
not syserr, android.util.Log instead;
clear up support in LoaderSetting;
make some private fields in BasicFileManager to protected
1: add remove method in CasheManager
2: not call onBitmapLoaded() if bitmap is null
3: check if download listener is null before use it
4: if local file exists, not load it again, even if null bitmap decoded
delete pom.xml