Update brew.plugin.zsh

Add `brew cleanup` command to `bubu` alias
Merge pull request #2969 from nicolas-brousse/patch-1

Update brew.plugin.zsh
add support to `take' for taking remote urls

Download, extract, and cd into the resulting directory.
add mgalgs theme
Fix gmt compdef

Fix typo: gm -> gmt
mgalgs theme: remove rvm stuff
mgalgs theme: spiffy up the colors, add per-host colors
mgalgs theme: more color spiffy'ing (256 colors)