Update README.md
Move vim settings out of plugins to ensure they all get correctly loaded after everything else [Fix #373]
Silence vim-session dialogs
Enable tmux to send-prefix using C-a a

* It's useful when you have a tmux session into another tmux session
  (ie. via ssh).
Removed sparkup from readme [Fix #403]
Add puppet module
Fix gitconfig colors causing iTerm with solarized to show diffs incorrectly
Changed reference to prezto master
Go back to using skwp prompt for rvm-prompt integration
Merge pull request #402 from imobach/master

Enable tmux to send-prefix using C-a a