Update build and license notices

[zanerock]

Overview

Update to use latest 'catalyst-scripts-node-project' based build.

Get right with licensing.

Deliverables

• [x] remove old catalyst-scripts and add new one; update Makefile
• [x] move js dir to default src
• [x] update LICENSE.txt to use the Apache 2.0 license
• [x] declare "license": "Apache-2.0" in package.json
• [x] add lecense declaration to file headers

[zanerock]

Work for this issue will begin begin on branch work-liquid-labs/regex-repo/5.