Summary:
Provide three Phriction methods for programmatic access to Phriction:
- phriction.info: get information about a document
- phriction.history: get change history for a document
- phriction.edit: create or update a document
I moved all the editing/creation logic into a new PhrictionDocumentEditor to
share code between the Conduit and Web edit pathways.
Test Plan: Got info and history via conduit. Edited and created new pages via
conduit and web.
Reviewers: hsb, jungejason, tuomaspelkonen, aran, hunterbridges
Reviewed By: hunterbridges
CC: skrul, aran, hunterbridges
Differential Revision: 866
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