Update Board Mac SDK Install script to work on clean mac
Install pip2 and homebrew as part of the sdk script, which aren't installed on clean systems
#!/bin/bash
# Need formula for gcc
+sudo easy_install pip
+/usr/bin/ruby -e "$(curl -fsSL https://raw.githubusercontent.com/Homebrew/install/master/install)"
brew tap ArmMbed/homebrew-formulae
brew install python dfu-util arm-none-eabi-gcc
pip install --user libusb1 pycrypto requests
