Created DB* classes
Added DBReader-methods
Adding AntennaPod as RSS/XML Reader
Implemented DBWriter-methods
Fixed NullpointerException in AddFeedActivity
Add missing resources in string.xml
Build media file name based on item title

Use the media item title as a filename base if exist, fallback on the url name
otherwise.
Updated translations, added Czech, Azerbaijani, Portuguese
Added transifex project configuration
Prepared release of version 0.9.7.4
Implemented several DBTasks and DBWriter methods
Split DownloadStatus into two separate classes

DownloadStatus is now used only for finished downloads, whereas
DownloadRequest is used for running/unfinished downloads
Merge branch 'eNBeWe-master' into develop
Implemented refresh, auto-download, auto-cleanup methods
Added search methods to DBTasks
Ported several classes from FeedManager to DB*-classes
Fixed build config files

Added support for proguard in maven build process, fixed signing issues with maven
Ignore IntelliJ project files
Added support for Links in MP3 chapters (using WXXX frame)
Added support for ID3 2.4 tag, resolved problems with frame size calculation