- Updated vital.
- Improved redraw_hold_candidates value.
- Fixed #339 undo source.
- Fixed undo source.
- Updated FAQ.
- Added g:unite_ignore_source_files.
- Improved documentation.
Wording change for error messages

I think this wording is a little better, but if we prefer to keep the old wording, we should correct the spelling of "attention".
Merge pull request #342 from oconnor663/patch-1

Wording change for error messages
- Fixed #341 g:unite_ignore_source_files.
- Fixed #340 auto-resize behavior.
- Fixed unite buffer name.
- Deleted :NeoComplCacheLock.
- Improved for auto completion.
- Fixed for rename.
- Improved waitpid behavior.
- Fixed #348 grep and vimgrep patterns.
- Added <Plug>(unite_toggle_mark_current_candidate_up).
- Fixed initialization.
- Fixed unite#start#script() behavior.