Remove Postgres app location from PATH

* Instead, keep a symlink to the postgress app's binary in ~/.bin
Break up git-create and github-init

- Use git-create to initialize a repository locally with git and
  remotely with GitHub in one command

- Use github-init to initialize a remote GitHub repo for an already
  existing local git repo
Fix colorscheme issues in vim settings

- Twilight theme now works consistently across console vim and gvim
- Line numbers are now absolute on the current line and relative on all
  others
update