Use latest Ruby version 2.1.2
Updates travis.yml to latest ruby version
Merge pull request #508 from nicolasblanco/ruby2-1-2

Use latest Ruby version 2.1.2
Version 4.5.4

- Ruby update
Fix preauthorize redirection bug in unhappy path
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