Tighten scope of formats

We only want to display ODI formats, not all of GDS formats too.
Remove section filter

This isn't helpful for ODI users.
Add in state column

To reduce confusion of what artefacts you're looking at, make it
clearer whether the artefact is live/draft/archived.
Fix tests

Removed section filter from tests as I'd removed it from code.
Also changed some of the artefact formats to be ODI specific.
Merge pull request #82 from theodi/fix_artefact_filtering

Fix artefact filtering