Merge pull request #11 from noels/master

Changes to import groups and dependencies.
Merge pull request #4 from ratajczak/reply

text formats
Merge pull request #12 from noels/master

Organogram and Forum migration
Merge pull request #14 from noels/master

Fixes and features for migrating dgud6.
Merge pull request #16 from noels/master

Remove dependency on mediafile.
Merge branch 'master' of github.com:datagovuk/dgu_d7
Merge branch 'reply' of github.com:noels/dgu_d7