Update to latest gem versions
remove cruft
Use the most recent, supported hunspell gem

- Hunspell gem doesn't need the native hunspell libraries, so I removed them
Merge branch 'gem-updates'
Add project monitor hook and use local db settings for travis
Merge branch 'update-travis'
Adding file missing from b240b31
Travis is unhappy with the custom database role, so removing
Require ff-hunspell properly
Fix Nokogiri warning
The spell checking doesn't work well, so removing

I'll try to restore some spell checking in future, but the
native hunspell libraries are causing travis errors and it looks like it
will be a complex issue to get them properly deployed on heroku. I
don't think it's working with current deploys.
Merge branch 'remove-hunspell'
Commit .env because it makes sense to have it in dev and test environments
Remove unneeded gems and upgrade some others
Fixing spelling mistake
Include gem that the activeadmin gem needs
Add a more comprehensive .gitignore config