Document how to user the browerstack testing option

Add documentation about browserstack configuration (#490)

* Add some documentation on configurating BrowserStack

* Add link to browser support doc

OBT rewrite - faster and smaller builds

Migration guide

Migrating from 6.X.X to 7.X.X

The ability to use OBT via it's programmatic API has been removed, if you were using OBT via gulp, you will need to migrate to the commandline version of OBT.
OBT has removed the ability to configure the way it installs/builds/verifies code, this is to ensure that systems built with OBT follows the Origami specifcation and conventions.

Beta release

Near complete rewrite of OBT to make it geared more toward Origami Component development.

v6.2.5

use raw-loader for .txt files (#473)

v6.2.4

Ensure only JSON is used for demo configuration (#453)

v6.2.3

Remove old way of specifying demos using javascript. (#452)

v5.6.2

Remove old way of specifying demos using javascript.

Add Safari >= 8 to autoprefixer config

#431

v6.2.1

:bug: Fixes 'The border-zero convention 'zero' in your config file is…

Simplify the command line module, pipe child process to stdout/stderr

v6.2.0

Pipe command output to stderr/stdout whilst keeping same interface (#…