add my zshrc.
Merge branch 'master' of github.com:dweinstein/oh-my-zsh

* 'master' of github.com:dweinstein/oh-my-zsh:
  Add tmux aliases
  Fix: Agnoster theme added venv name even if disabled See http://www.virtualenv.org/en/latest/index.html\?highlight\=virtual_env_disable_prompt\#activate-script for info regarding this.
  Moved misplaced plugins.
  gitignore fix for custom folder.
  More expressive symbols for git and mercurial.
  Check bundler version to avoid error with unsupported command line arguments
  Add commonly used git stash aliases
  PLUGIN: gpg-agent: export SSH_* environment variables too
  fix gpg-agent "running already" check
  ohmyzsh plugin of the z project: https://github.com/rupa/z