Add homebrew and python installer

homebrew/install_stuff.sh

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+#!/bin/bash
+set -o nounset
+set -e
+set -x
+brew -h || (echo "Installing homebrew" && /usr/bin/ruby -e "$(curl -fsSL https://raw.githubusercontent.com/Homebrew/install/master/install)")
+# Javascript manipulation - important!
+brew install jq
+brew install fx
+brew install parallel
+brew install gprof2dot
+# ag - etc
+brew install the_silver_searcher
+

python/install_system_pythons.sh

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+#!/bin/bash
+# I use pyenv by default because it's *way* easier to manage than homebrew and
+# makes it much easier to juggle multiple versions of python without killing
+# your whole install.
+set -o nounset
+set -e
+set -x
+brew install pyenv
+pyenv install 3.6.4
+pyenv install 3.7.2
+# 😭 sigh...
+pyenv install 2.7.12
+pyenv global 3.6.4