Added xvim config to repo

Added xvim config and included it in the list of setup files to symlink
into the home directory
added a bunch of stuff in an effort to color my prompt based on git status. checkpoint.
Got prompt coloring to work how I want

Folder is a bright white, git status alternates between green for clean,
blue for staged, and red for unstaged. Parens around the git status do
not share the color.