Add questions

* As a user I can create questions for my survey
* Partial without connection to survey
A little old, but should still help

https://currentricity.wordpress.com/2011/09/04/the-definitive-guide-to-accepts_nested_attributes_for-a-model-in-rails-3/

http://stackoverflow.com/questions/18540679/rails-4-accepts-nested-attributes-for-and-mass-assignment