Update vimrc

- Add vim-ruby plugin

- Add vim-rails plugin

- Move github_user variable above the auto-install for plugin
  (otherwise it errs cause variable is missing)

- Set proper width for dwm master pane
  - 80+ because some columns like line number take up space
  - Maybe better to use a percentage?

- Have dwm autoresize
  (otherwise setting width doesn't make a difference)

- Add autocompletion for ruby/rails

- Make my python def abbreviation specific to python files

- Add def abbreviation for ruby files
Update config.fish

- Load rbenv automatically

- Set default editor to vim