Update submodule oh-my-zsh 05a074c...5e258d1

* oh-my-zsh 05a074c...5e258d1 (3):
  > Use ZSH_IS_SLOW_DIR instead of ZSH_DISABLE_VCS_INFO
  > Drop `gv` alias, using a script instead
  > zsh: move `stty -ixon` from zshrc to zshenv
Add gv script: edit files in a global gvim instance
Add git-wtf script
Remove vim/bundle/powerline-vim
vimrc: cleanup: move most `:set`tings to the top