Getting responses to copy from one response_set to another
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