Merge pull request #347 from mfrederickson/master

Add database schema docs
Clean up user#show permissions. Hide lots of private stuff.

Added auth checks for all the private things on a user#show page like memberships, screens, and content.
Also removed child content, closing #332.
Some work in groups#show for #345
Some basic exception work for #222
Move content shuffling out of controller per #23.

More work is needed to make this modular / plugin friendly.
Merge branch 'master' of github.com:concerto/concerto
Don't break the UI if content lacks a start or end time.
A proper seed for #348 ?
Add client time for #348.
Formatting work on groups#show.
Rolling the Travis dice per #292
Some basic cleanup and fixes to plugins form to fix #353
Tweaks to dashboard to fix #352
Added edit/delete links for sub feeds to fix #350
Include Weather plugin by default, close #314.
First pass at automatic text sizing for #63.
add translation for 'Are you sure?' #355