Make up also update TeX Live
Add `urdh` prompt theme

A theme with git and mercurial support, including a right prompt. Also
includes fish_greeting and fish_title functions.
Merge pull request #1 from urdh/up-tlmgr

Make up plugin also update TeX Live
Merge pull request #2 from urdh/urdh-theme

Add `urdh` prompt theme