add rule and loader to get generated tags

[vonagam]

For #156

[brunocodutra]

Any idea why tests are failing on Windows?

[vonagam]

The problem lies in non reproducible builds of js bundle.

To get reproducible builds on my personal machine (mac) i used OccurrenceOrderPlugin, seems it does not help with builds between machines.

[brunocodutra]

What if we teach compare to evaluate main.js (or any file that ends in .js for that matter), similarly to what we do here, and compare the output rather than the contents directly?

[vonagam]

Added some description to README.

Fixed rule tests. Made bundle js output to export tags with cjs so that we can compare them with expected result by simply requiring them.

Offtop: In cache tests you use t.pass(some true value). I think you wanted to use t.true (or t.truthy for length value), because t.pass accepts only message to show, so even if you call t.pass(false) it passes.

[coveralls]

Pull Request Test Coverage Report for Build 688

• 17 of 17 (100.0%) changed or added relevant lines in 2 files are covered.
• No unchanged relevant lines lost coverage.
• Overall coverage increased (+0.8%) to 93.671%

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Totals
Change from base Build 681:	0.8%
Covered Lines:	102
Relevant Lines:	103

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💛 - Coveralls