make session detachable
Merge branch 'master' of github.com:tunix/oh-my-zsh

* 'master' of github.com:tunix/oh-my-zsh: (174 commits)
  added motd plugin
  Adding MIT-LICENSE Closes #655
  Fix the fix for Issue #1479
  fix for Issue 1479
  Fixes #1489
  add unbundled command
  Revert "agnoster theme shows error code instead of an "x""
  Add Stash toogle to display if there's some stash or not in `git_prompt_status`
  fixes #1474 add zeus to bundle exec listx
  use feature names instead of failing branch names in "git flow feature"
  Unset `config_file` variable in oh-my-zsh.sh
  Added a `migrate` alias.
  Fix prompt color: Change it back to green
  plugin last-working-dir: create cache-directory if it doesn't exist
  Print last exit status in mortalscumbag prompt
  urltools for Everyone
  Backwards Compatible Jira URLs #1378
  use lazy load for virtualenvwrapper
  hg_current_branch added to mercurial plugin
  Fixing conflict in install scripts
  ...