Remove Brewfile

Homebrew no longer supports it, anyway

Brewfile

-# Run `brew bundle` to automatically install these packages
-# http://robots.thoughtbot.com/brewfile-a-gemfile-but-for-homebrew
-#
-# Note that running edx-platform on OSX directly is unsupported: this file
-# exists for development purposes only. The recommended way to run edx-platform
-# on OSX is to use devstack, which installs edx-platform on an Ubuntu VM.
-# See: https://github.com/edx/configuration/wiki/edX-Developer-Stack
-
-install readline
-install sqlite
-install gdbm
-install pkg-config
-install gfortran
-install python
-install yuicompressor
-install node
-install graphviz
-install mysql
-install geos
-install mongodb
-install lynx
-install libjpeg
-install libtiff