Added information on how to contribute
Updated so that the headings display properly

Previously headings would just display with two ** on either side of the heading.

The proper markdown is to use '-' underneath the heading.
Merge pull request #266 from TomHennen/patch-1

Updated so that the headings display properly
Merge branch 'release-0975'
Updated dslv submodule
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'
Created playback package inside service package
Moved background tasks of PlaybackService into PlaybackServiceTaskManager
Added first version of PlaybackServiceMediaPlayer
Added tests for PlaybackServiceTaskManager
Added feedback section
Added basic tests for PlaybackServiceMediaPlayer
Made PlaybackService use the PSMP and PSTM
Adapted remaining classes to new playback service model
Updated video player UI
Use AspectRatioVideoView instead of standard video view
New media files in FeedItems were not handled correctly. Should fix #327
Updated version numbers in build.gradle
Applied bugfix from pull-request #313