Upgrade to ruby 2.1
[Bootstrap 3 migration] span* -> col-md-*
[Bootstrap 3 migration] offset* -> col-md-offset-*
[Bootstrap 3 migration] brand -> navbar-brand
[Bootstrap 3 migration] navbar nav -> nav navbar-nav
[Bootstrap 3 migration] Buttons
Remove deprecated class in bootstrap 3
Fix navigation bar
Update deprecated bootstrap classes
Fix layouts and home page for bootstrap 3
Fix user's list for bootstrap 3
Whitespace
Whitespace fix
Remove hover background from navbar
More css fixes in users list
Fix user profile for bootstrap 3
Gem upgrade
Fix margin in layout
Bundle update (after seven months)

Most important changes is migration to rspec 3
Remove explicit "gem 'guard'" from Gemfile

It's redundant having guard-rspec