Created initial feature test for adding response

- Made Factory for responses and prompts
- Created controller spec for responses
Updated gitignore
Created a test for response#create.

-Created associations has_many responses and belongs_to prompt.
Created test for creating invalid response

- Added validation to response model
- Removed unnecessary coverage/ files from git (make sure it doesn't
get committed again)
Added form for adding response to prompt

- Completed Create Response feature.
- Create response tests passing.
Merge pull request #6 from eddiekimosabe/create_responses

Finished Create Responses feature