this consolidates the code from pull request #253 (flattr queue and auto flattr) into a single commit, rebased onto the current development branch
Merge branch 'develop_flattr_queue_autoflattr' of git://github.com/peschmae0/AntennaPod into flattr_queue_autoflattr

Conflicts:
	src/de/danoeh/antennapod/storage/DBReader.java
	src/de/danoeh/antennapod/storage/PodDBAdapter.java
get unittests to compile with new FlattrStatus()
Re-enable support for the "Flattr this app" item in Settings
* directly update Feed/FeedItem FlattrStatus instead of writing back entire Feed/FeedItem to database
* fix race condition when fetching FlattrStatus
* fix missing copy of Flattr status in Feed.updateFromOther()
* fix feed reading from db, was missing FlattrStatus

followup on #331
Load only Flattrables in flattr queue from the database.
avoid waiting on the GUI thread
* don't load all Feeds and FeedItems to memory when refreshing the flattr status
    with items received from the flattr api
* added method for resetting flattr status of all feeds and items

This adresses https://github.com/danieloeh/AntennaPod/pull/331#issuecomment-32112929
items 1 and 3.

followup on #331
* include error message from Flattr4j in notification (subText shows message for first failed flattr)
* big extensible flattr notification with full list of error messages

followup on #331
* make FlattrClickWorker drop toast when launched interactively
  as part of a flattr action (by explicitely flattring a thing)
* make it report a notification when it was launched implicitly
  (when refreshing feeds) or when flattring failed

followup on #331
Merge branch 'flattr_queue_autoflattr' into develop (#331)

Other changes:
- Changed FlattrStatusFetcher into Thread-subclass
- Changed auto-flattr mechanism so that it's compatible with the updated PlaybackService
- Changed a couple of strings

Conflicts:
	src/de/danoeh/antennapod/storage/DBReader.java
	src/de/danoeh/antennapod/storage/DBWriter.java
	src/de/danoeh/antennapod/util/menuhandler/FeedItemMenuHandler.java
	src/instrumentationTest/de/test/antennapod/storage/DBReaderTest.java
Reformatted code
Merged pull-request #346
FeedStatistics list was not sorted correctly
Resolved issue with guids in rss 2 feeds. fixes #351 and #336