Now podcasts series will be loadedinto Downloads\Podcast_name directory.
Improvements for thread safety.
Bug fixed:
- Files weren't read from subdirectories.
Now podcast items are sorted by descending PubDate when they come from database.
Fixed bug when you chose downloaded item and item in download process and button Download was still available.
Version changed to 0.9.4
Merge branch 'master' into release

Conflicts:
	pCaster/Model/PodcastLogic.cs
	pCaster/Properties/AssemblyInfo.cs