Add Warden detection, improve spec coverage
Bump gem version
Only perform CI for standard MRI versions
Update text to point out Warden integration
Fix NPE when no referrer is set
Merge branch 'master' of https://github.com/datenimperator/rakwik

* 'master' of https://github.com/datenimperator/rakwik:
  Update text to point out Warden integration
  Only perform CI for standard MRI versions
  Bump gem version
  Add Warden detection, improve spec coverage
  Bump version
  Allow jruby to fail
  Emulate decode_www_form for 1.8.7
Bump minor version after bugfix
Update ruby version
Fix error when request includes no user agent
Bump minor version after bugfix
Fix rspec deprecation warning
Merge remote-tracking branch 'upstream/master'

Conflicts:
	spec/lib/rakwik/tracker_spec.rb