Fixing Y behaviour
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]
Remove unused run_tags. Use :Rtags instead
Upgraded hub command
Added vim-session; :SaveSession and :OpenSession [Fix #322]
Don't use powerline fonts in airline [Fix #367] maybe
Remove redundant recommended OSX tool 'autojump' 

autojump 'j' functionality is matched/replaced by fasd 'z' command (installed and enabled as a prezto submodule by default). Instead of typing `j [dirspec]`, you simply type `z [dirspec]`.
Merge pull request #377 from phillipalexander/patch-1

Remove redundant recommended OSX tool 'autojump'  from README.md
merge upstream