Reverting Socrates Revival experiment

Reverting http://phabricator.khanacademy.org/D5226
See https://docs.google.com/a/khanacademy.org/document/d/1UQECMUQ5Qbsx07uePzI5xuu2sjOUr_QCo2_1nEMWR-o/edit# for a write-up of results.

Auditors: jace, benjaminhaley

Test Plan:
1. visit http://127.0.0.1:8080/math/arithmetic/fractions/Equivalent_fractions/v/equivalent-fractions
2. Notice that Options -> Embedded questions is defaulted to OFF
3. Turn embedded questions on, see that they show up correctly.
4. Let the video play to a question, answer it.
5. Click the question mark icon for one of the questions, answer it.

Everything works!