start ChangeLog table
Merge branch 'master' into feature/db-log

Conflicts:
	fwadmin/tests/test_views.py
Merge branch 'feature/host_created_at' into feature/db-log
add migrations
Merge branch 'feature/host_created_at' into feature/db-log

Conflicts:
	fwadmin/models.py
add changelog table
improve changelog admin site
fix a pep8 issue :(
Merge branch 'master' into feature/db-log
Merge pull request #33 from pgolm/feature/db-log

changelog