add simple form for entering a new question

[cjlee112]

The whole requirement for getting the right input csv format represents a significant barrier to entry for a new user. It would be far easier for a new user to just type in a question in a web form. For simple text questions, that is really easy. This is worth doing. Probably also need to let user edit or delete questions directly in the Socraticqs instructor interface.

Also save the user's questions as ReST.

[cjlee112]

form would be

• title
• question text... presumably in simple text with optional equations
• answer text

Should it enter standard ABORT / FAIL error models?