merging local changes into my github prezto fork
Merge branch 'master' of https://github.com/jastuccio/prezto

* 'master' of https://github.com/jastuccio/prezto: (27 commits)
  [Fix #724] Unquote variable
  Fix typo
  Create a new tmux session if none exists
  Remove extra git-dir call in git-info and use git_dir variable instead
  Enable iTerm2 tmux integration
  Inform how to add SSH identities to Keychain
  If a default Ruby is set, switch to it
  Convert the PeepCode theme to git-info
  Add paradox theme
  Fix theme function declaration style
  Add pure theme
  Add agnoster theme
  Add powerline theme
  Update sorin theme screenshot
  Indicate inside Emacs
  Indicate SSH connections
  Add cloud theme
  Add ruby-info to smiley theme
  Add smiley theme
  Escape '%' in path
  ...