Trim release dates to year

This makes it consistent with how dates are handled in expr.c
Merge pull request #89 from alexkay/master

Trim release dates to year
Add solarized light/dark themes

Requires your terminal to be set to solarized:
https://github.com/altercation/solarized

More info from solarized: http://ethanschoonover.com/solarized

Themes originally based on data/green-mono-88.theme
Merge pull request #92 from losingkeys/solarized

Add solarized light/dark themes
[Themes] License the 'Night' theme under the GPL v2
Merge pull request #93 from pejakm/nthl2

[Themes] License the 'Night' theme under the same license as cmus