Summary:
This adds support for viewing individual versions on a fragment as well as comparing versions and downloading diff_match_patch-based patches.
It does not use the side-by-side diff format as while it works for small changes, it quickly becomes impossible to distingush what changes have been made due to the diff_match_patch format.
Test Plan: Clicked on versions and downloaded patches.
Reviewers: epriestley, #blessed_reviewers
Reviewed By: epriestley
CC: Korvin, epriestley, aran
Maniphest Tasks: T4205
Differential Revision: https://secure.phabricator.com/D7734
Summary: Ref T4205. This is an initial implementation of Phragment. You can create and browse fragments in the system (but you can't yet view a fragment's patches / history).
Test Plan: Clicked around and created fragments.
Reviewers: epriestley, #blessed_reviewers
Reviewed By: epriestley
CC: Korvin, epriestley, aran
Maniphest Tasks: T4205
Differential Revision: https://secure.phabricator.com/D7726
