Merge pull request #32 from bigzed/master

Fixing specs of sidekiq-status to be compatible with Rspec 3.0 and Sidekiq 3.1.4
version bump to 0.5.1, changelog updated
ruby 2.1.2 specified for Travis-CI
Merge pull request #1 from lucke84/import_latest_changes_from_utgarda_master

Import latest changes from utgarda master