Add very basic virtualenv plugin

checks for $VIRTUAL_ENV and provides to basename in a function for the prompt.
vagrant uses 'ssh-config' command, not 'ssh_config'
'rails' command should not be run with bundle exec

http://blog.wyeworks.com/2011/12/27/bundle-exec-rails-executes-bundler-setup-3-times
http://yehudakatz.com/2011/05/30/gem-versioning-and-bundler-doing-it-right/
modify themes/jnrowe.zsh-theme, add host directive "Ξ (mbsd) ~ →"
Merge branch 'master' of https://github.com/robbyrussell/oh-my-zsh
merge from upstream master
check for knife.rb in cwd

this is useful when managing multiple chef servers
add maven zsh autocomplete plugin, copy from juvenxu's bash maven autocomplete plugin
Bwana plugin for reading man pages in Safari
Added avit theme
Added git-extras completion
Added credits
Fix changelog --list completion bug
auto-upadate feature will now reset the epoch so that if a user doesn't say yes, it won't ask them again for a while. fixes #1240
Merge pull request #1229 from seban/run_rails_without_bundle_exec

'rails' command should not be run with bundle exec
added 'gcl'for 'git config --list'; and gd for 'git diff'
improvement: define PROMPT_HOST once on startup
Adding a symfony plugin, for symfony 1
delete os specific disable-patterns
Merge