Remove functions wrapping Zeus

Project should be moving over to spring, as this is the 'blessed'
approach and is part of suspenders. Leaving these functions around adds
yet another layer of indirection to consider when trying to run these
commands:

* function wrapper
* binstub
* rbenv shim
* actual binary
Remove trailing whitespace in gitmessage
Automatically prune remote branches when fetching

* Removes the need to occasionally run `git remote prune`.
* Remove branches when fetching instead of deleting other branches.

https://trello.com/c/ePlghTll/249-configure-git-to-prune-on-fetch
Add vim-mkdir

`:e some/non_existent_directory/new_file.txt` usually errors out because
the directory does not exist, but with `vim-mkdir` the non-existent
directory will be created automatically.
Enable shiftround

With `shiftround` enabled, using `>>` will indent the line to the next
multiple of `shiftwidth`. This is useful when you are indenting
improperly indented code.
Run commands interactively from vim

This allows us to do things like:

    <Leader>r migrate
Fix out of date README on rake, rspec commands

`rake` and `rspec` commands that wrapped `zeus` were removed in 00dbd15.
Show only basename and git branch in prompt

* Switch order from "[git branch][pathname]" to "basename git branch %".
* Remove noisy brackets.

Example old:

    [master][~/dev/thoughtbot/dotfiles]

Example new:

    dotfiles dc-prompt %
Have Syntastic ignore angular attribute warnings

The Syntastic HTML linter will warn on propriety attributes. The
likelihood that you *accidentally* typed "ng-repeat" is low. Let's just
assume you know what you're doing and ignore warnings about "ng-*"
attributes.
Remove test:prepare from migrate alias

* `rake db:test:prepare` has been depreciated in rails 4.1
Remove Zeus and Cucumber references

* Spring is now built in to Rails:
  http://weblog.rubyonrails.org/2014/4/8/Rails-4-1/
* Haven't used Cucumber on a project in over a year
tat: create tmux session if nonexistent
Add Shift+Tab map for tab complete in insert mode

Feature parity with `<c-p>` `<c-n>` tab completion duo.
Set Vim's colorcolumn to 80 characters

* We have an 80 character formatting limit
* This makes it obvious where that limit is
Added local config changes
Moved vimrc changes into local
Moved vimrc bundles into local
Added .tm_properties to global gitignore
Added bundler aliases
Changed PS1 to preferred value