Add tasks specific for using appraisal to test different versions
of Rails as well as Rack, Rake & Sinatra to Rakefile
Update CircleCI to use parallelization to run tests for all integrations and cucumber tests for all environments
explicitly
Ensure that integration tests can use the same helpers as unit tests
Fix errors causing features to fail
Add sqlite3 for Rails 3.2 & 4.0 appraisal gems
Fix integrations with Rails 3.0 by locking sucker_punch to v1.0.2.
ActionDispatch::Reloader causes errors when hit in the sucker_punch v1.0.3 library.
Merge pull request #285 from airbrake/adjust-ci-integration

Adjust ci integration

@zefer reviewed