Revert "Fix: dirty worktree after running 'rake install'"

This reverts commit 50fdb9109f43ad8185b9cc2a36cc94db953d3b0c.
[Fix #311] zsh/presto gets "modified" after clean install
adding brew update
follow presentation style
Merge pull request #359 from victormours/adding-brew-update

Adding brew update to Rakefile
Merge pull request #357 from nandalopes/fix-311-dirty-worktree

[Fix #311] zsh/presto gets "modified" after clean install
Fixing Y behaviour
Add :ChangeHashSyntax for ruby 1.8->1.9 hashes
Remove lusty juggler / not using
Remove duplicate of vim-slim on vundles
Merge pull request #369 from bridgeutopia/master

Remove duplicate of vim-slim on vundles
Updates RubyGem sources

`gems.rubyforge.org` and `gems.github.com` have been replaced with `rubygems.org` as RubyGems sources
Swapped out powerline for airline [Fix #372]
Merge pull request #375 from DanielWright/patch-1

Updates RubyGem sources
Remove duplicate vundles (thanks fayimora)
Merge pull request #364 from lfilho/yankring-Y-behaviour

Fixing Y behaviour
Added simplified steeef theme without newlines
Switch to steeef_simplified prompt which doesn't seem to be problematic like the skwp prompt with newer prezto installs [Fix #272 #286]
Added multicursor - hit Ctrl-n to select multiple things and then i/c them! [Fix #368]
Kill sass-status [Fix #361]