Adding check for null cursor and invalid column index in getRealPathFromContentURI() method. Fixes #584.
Adds support for downloading externally hosted videos to add to the post editor.
Merge branch 'develop' into issue/584-media-crash
Adding check that activity is still around after downloading media.
Run the DownloadMediaTask AsyncTask in the thread pool executor so that it doesn’t block other AsyncTasks.
Merge pull request #593 from wordpress-mobile/issue/584-media-crash

Fixes #584