DownloadFileTask: Recursive resolving of redirects across schemes
AsyncTaskUtils for switching between execute and executeOnExecutor
Merge pull request #34 from bitstadium/feature/recursiveredirect

DownloadFileTask: Recursive resolving of redirects across schemes
Merge branch 'feature/taskexecute' into develop

Conflicts:
	src/main/java/net/hockeyapp/android/tasks/DownloadFileTask.java