安装所有东西：
brew tap michaeldimmitt/taps &&
brew install dir &&
brew install reveal ;
需要更多水龙头吗？ 看：
如何以显示为例快速更新水龙头
brew edit reveal
# change the url
brew install reveal
# get the latest sha value
# update both in this github project.
brew reinstall reveal ;
# check the update with: brew edit reveal
# note: if reveal is not installed on your computer... homebrew has a cask named Reveal and even if
