Fix for Projects -> Documents ( N + 1 ). Pong to Norbert
Fix perfomens problems for index page and show page
Fix performance problems for documents show page
Change the Bullet config
Fix the failed test what caused our modifications.
FIXES #78649336 - heroku wont be able to make use of arrays fed to Settings
Fix another N+1 performance problem on articles.
Merge pull request #585 from Sysqa/performance

Performence optimization for projects and documents pages
updates schema by run db:migrate
Merge pull request #589 from johnnymo87/update-schema

updates schema by run db:migrate
Merge pull request #588 from erpe/feature/newsletter_fix

FIXES #78649336 - heroku wont be able to make use of arrays fed to Setti...
updated Gemfile to add Twitter gem
resolve rebase conflicts
renamed 'Twitter to Twitterable' - cause twitter.gem uses Twitter as module-space. commented specs - included Twitterable in EventInstance
use self !
moved twitter hangout notifcation out of concern
cleanup
tests for twitterable module
spec after_save hook
fix bad method name in test