create certificate on completion of response_set
added link to certificate from dataset page
added basic guard-test as a development dependency
set attained level on certificate from response_set
allow certificates to be viewed
Getting responses to copy from one response_set to another
restructured so that certificate is created from the response_set
Merge pull request #99 from theodi/certificate-creation

Certificate creation
Adding tests for copying answers across response_sets
Changed response_set-copying method to not take an id - we'll need permissions checks higher-up, so they might as well pass the objects they'll have loaded
Shoe-horning in the functionality to duplicate response_set answers into a new survey. When the views are designed, this will need to change again.
Merge branch 'master' into copying_response_sets

Conflicts:
	app/models/response_set.rb
	test/unit/response_set_test.rb
Merge branch 'master' into copying_response_sets

Conflicts:
	app/models/response_set.rb
	test/unit/response_set_test.rb
Merge pull request #100 from theodi/copying_response_sets

Copying response sets
formatting conditions for repeaters
added quotes around string values
Updating incomplete response_sets when survey has new version
Fixing bug in creating new response_set when survey is superceded, and DRYing checks for completed response_sets
Moving dev/test surveys to subdirectory so they don't get parsed by the tests and deployment rake task
Ensuring that only incomplete response_sets can get updated automatically