Slightly improve translation of Holo Blue.
Add Solarized Light / Solarized Dark text color themes.

See this web site for a description of the Solarized color scheme:

http://ethanschoonover.com/solarized

Note that this is not the full solarized palette, it's just the foreground
and background colors. Perhaps we can implement the rest of the palette in
a future update.

Author: Nick Shvelidze<shveloo@gmail.com>