Allow side-by-side usage with external Soda Theme

As "Sodarized" recommends direct installation via git (git clone -b sodarized https://github.com/jrolfs/soda-theme.git "Theme - Sodarized") these changes allow a user to install it side-by-side with the regular Soda theme. I imagine that the texture folder names will change at some point in the future as well, but making it work for now was the goal.

Excellent work on the theme, by the way!