Add Mozilla Persona Omniauth Gem and initializer
Add (ui-only) Persona button to login modal
Add basic Persona functionality

1. No session integration yet, so automatic login/logout events are suppressed.

2. Popup blockers must be disabled: submits form to target="_blank"
Use AJAX for submitting Persona credentials.

Fixes issue with needing to unblock popups.
Make Persona configurable
add basic coding style guidelines to CONTRIBUTING.md
Get secret_token from ENV['SECRET_TOKEN'] (e.g. for Heroku)
Fix display host for onebox
Fix weirdly indented code
trying to get jshint to work on travis
bumped rb-inotify gem version

as per the recommendations given by guard
Change the name displayed in the header on profile update
Removing unnecessary Rails.env check
make Enum#valid? specs test the right thing
move IncomingLink callbacks into their own methods
minox TOS HTML fixes
Removed Strange Test-Output
server side of Czech language localization + update of client side + update of pseudo-localization
Merge pull request #336 from kubabrecka/cs_server_translation

server side of Czech language localization + update of client side + update of pseudo-localization
Merge pull request #335 from jk779/ugly_test_output

Removed Strange Test-Output