update .gitignore for MacOS files
Add our README as separate file
Add M550 code to spit out some info, including compilation date
Documented Auto Bed Leveling
ABL at any points
Configure for MissionBot as of 2014-02-17

Geeetech Printrboard with Auto Bed Leveling & Z Safe Homing

Touches
    Marlin/Configuration.h
    Marlin/Makefile
    Marlin/pins.h
Enable Travis & Vagrant

Can do 1-step compile in Ubuntu
Configuratior script lets us control #defines using environment variables

Teensy cores are installed from our private Amazon S3 bucket
Testing improvements
- Test Delta-bot configuration
- Use test runner script that can be run locally
set environment variables in Vagrant box
test runner improvements