Provide generic colouriser

Summary:
The grc command acts as a standard filter to colourise input.
See https://github.com/garabik/grc for documentation.

Include MySQL configuration by Jaime Crespo (@jynus).

Test Plan: grc env

Reviewers: dereckson

Reviewed By: dereckson

Differential Revision: https://devcentral.nasqueron.org/D1186