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
Merge branch 'develop'
Added feedback section
Do not add things to the flattr queue if the user isn't logged in

- Bugfix: The no-token dialog was shown every time a feed was refreshed if the user wasn't logged in and had clicked the "flattr this" button before
Pulled translations
Merge branch 'develop'