Difflume

- Fix rewriting Fauxton urls
- Quote rewrited URLs
- Update readmes

- Update help

- Preload revisions

- Add ability to select a diff type
- Add Ndiff Collapsed diff type

- Hotkeys supports Cyrillic layout
- Handle IO errors

- Support for CouchDB
- Support for viewing revisions (only CouchDB)
- Syncing content between panels
- Refactor UI-related code
- Still no tests (almost)