Drop unused database tables
Fix map search
Fix minor typo
Merge pull request #539 from sharetribe/map-search-fix

Fix map search
Merge pull request #538 from sharetribe/database-cleanup

Drop unused database tables
Add condition to filter messages based on current community.
Update header to show unread messages only from current community.
Remove unused code.
Migrations and structure.sql.
Refactor to decrease db queries.
Add fragment caching to global header.
Move cached header code to own partials.