Move AVAILABLE_LOCALES to own file

- Zeus breaks if the application.rb contains the array of locales (non
  utf-8 codes)
Merge pull request #509 from sharetribe/available-locales

Move AVAILABLE_LOCALES to own file
has_many with count
Link colors
Remove some hard-coded colors
Get rid of gradient button
Remove deprecated PersonMailer.deliver_community_updates
Use premailer in all mails
Messages and participations
Disable message and participants for now
Fix tests
has_many admins
Add custom color to community
admin escrow canceled
All mailviews working
Test data for emails
Improvements
Fix the rest mails
Fix indent
Maybe colors