Start on a smarter install process

Run a script that installs from Homebrew. Eventually this would
be great to nuke the rake dependency and do it all in shell. I
kind of hate all of this... this should be more modular and
cleaner. Always something to do!

This also closes holman#31.

README.markdown

@@ -18,13 +18,16 @@ subject](http://zachholman.com/2010/08/dotfiles-are-meant-to-be-forked/).
 
 ## install
 
-- `git clone git://github.com/holman/dotfiles ~/.dotfiles`
-- `cd ~/.dotfiles`
-- `rake install`
+Run this:
 
-The install rake task will symlink the appropriate files in `.dotfiles` to your
-home directory. Everything is configured and tweaked within `~/.dotfiles`,
-though.
+```sh
+git clone https://github.com/holman/dotfiles.git ~/.dotfiles
+cd ~/.dotfiles
+script/bootstrap
+```
+
+This will symlink the appropriate files in `.dotfiles` to your home directory.
+Everything is configured and tweaked within `~/.dotfiles`, though.
 
 The main file you'll want to change right off the bat is `zsh/zshrc.symlink`,
 which sets up a few paths that'll be different on your particular machine.

script/bootstrap

@@ -0,0 +1,9 @@
+#!/bin/sh
+#
+# bootstrap installs things.
+
+# Assume everyone's on OS X and run Homebrew (*nix-ers beware)
+. script/homebrew
+
+# Run the install (I'd like to pull this out of rake, eventually)
+rake install

script/homebrew

@@ -0,0 +1,19 @@
+#!/bin/sh
+#
+# Homebrew
+#
+# This installs some of the common dependencies needed (or at least desired)
+# using Homebrew.
+
+# Check for Homebrew
+if test ! $(which brew)
+then
+  echo "  x You should probably install Homebrew first:"
+  echo "    https://github.com/mxcl/homebrew/wiki/installation"
+  exit
+else
+  echo "  + Homebrew found."
+fi
+
+# Install grc and coreutils
+brew install grc coreutils