Initial revision

Summary:
Linter code initially written by Joshua Spence

Initial source: https://secure.phabricator.com/D11657

As initially submitted for Arcanist, this source code is licensed
under Apache License 2.0 - http://www.apache.org/licenses/

Test Plan:
Test procedure used the linter in an actual repository with shell scripts:

• deploy globally on development server
• configure the linter for rOPS (D936)
• arc lint before and after D937 change (using a .sh file)

Reviewers: dereckson

Reviewed By: dereckson

Differential Revision: https://devcentral.nasqueron.org/D935