removed some unnecessary gitkeep
moved surveys to development folder, updated rake task
added dev certificate generation survey
allow :text_as_statement and :display_on_certificate to be defined on question
render response set in certificate
allow questions to be filtered if they should be displayed on the certificate
added tests for certificate display
documented some of the surveyor extensions
added some of the attributes for displaying on certificate
refactored back into response_set
took logic from view and refactored a bit
added section test and cleaned up response_set test
Merge branch 'master' into certificate-attributes

Conflicts:
	db/schema.rb
	surveys/development/languages.rb
Merge branch 'master' into certificate-attributes

Conflicts:
	test/factories.rb
Merge pull request #106 from theodi/certificate-attributes

Embed questionnaire on certificate page