JS Files update should only only touch particular files

[DamonOehlman]

The JS file updating works really well, but it is perhaps a little aggressive. One example that I hit today was version upgrading the rtc.io site and the minified version of glue was updated.

As such, I think the JS updating behaviour should be limited to a set of known JS files, probably the following:

• index.js
• lib/index.js
• %modulename%.js
• metadata.js
• package.js