Force vim to use Solarized 256 color scheme.

Must use degraded scheme if terminal itself does not use Solarized
color scheme.
Add pathogen file (symlinked to pathogen repo).
Add Solarized color scheme to README feature list
Merge branch 'master' of https://github.com/goxberry/dot_vim

I have no idea why this merge is necessary, to be honest. How in hell
did the branches diverge? All I did was add submodules...