move macvim to recipes and add options to override sytem vim

[CodisRedding]

options override the default system vim and others are needed with macos

[cowboy]

I'll look into this, thanks!

[CodisRedding]

I do think that the spaces in the macvim args are causing an issue with the way the array is iterated over during installation. I tried wrapping it in double quotes but after setdiff the args are iterated over instead of the double quoted macvim line with args.

[CodisRedding]

so, because of the wild way that bash handles arrays I ended up having to run a string replacement to handle args in brew recipes.

1. string replace token https://github.com/CodisRedding/dotfiles/blob/codisredding/init/20_osx_homebrew.sh#L36-L37

2. add token to recipe (puke)
   https://github.com/CodisRedding/dotfiles/blob/codisredding/init/30_osx_homebrew_recipes.sh#L26

This ended up working BUT macvim now does require the full xcode install, no longer can you use just the tools. =/