Add Homebrew to the Makefile
Install Homebrew libraries through the Makefile
Install Python libraries through the Makefile

`easy_install` will try to install the pip folder, so that commands
needs to be executed from a different working directory.
Install the Heroku CLI through the Makefile
Add a bootstrap to the Makefile

This essentially replaces my `initial_setup.sh` script
(https://gist.github.com/dirn/2993226). It not only executes everything
form the script, but it will also run `make install` and set up all of
my dotfiles as well.
Create missing folders in the Makefile

When symlinking dotfiles, it's good to make sure folders exist before
symlinking a file into them.
Fix the length of a line in the Makefile