Rails 4 compatibility
Travis: Fixed matrix syntax
Travis: Fixed RubyGems source to use https
Fixed gemspec: Requires Rails >= 3
Fixed timezone issue with Rails 3
Merge branch 'master' into rails4
Travis: Exclude Ruby 1.8.7 from testing with Rails 4
Always use UTC timestamps
Use Time.current instead of Time.now.utc
Tests: Improved Timecop usage
Tests: Fixed comparing timestamps
Trying to fix Travis issues with comparing timestamps
Reverted needless changes
Merge pull request #16 from ledermann/rails4

Rails 4 compatibility (2nd approach)