Summary: Updates Legalpad to use EditEngine, paving the way for //transaction comments//. Spooky.
Test Plan:
- New Document
- Require signing, Corp - see fail
- Require signing, Noone - see fail
- Require signing, Ind - get asked to sign
- Edit Document
Reviewers: epriestley
Reviewed By: epriestley
Subscribers: Korvin
Differential Revision: https://secure.phabricator.com/D17862
