test(curriculum): check tests against solutions

[ValeraS]

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• My pull request has a descriptive title (not a vague title like Update index.md)
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If your pull request closes a GitHub issue, replace the XXXXX below with the issue number.

Closes #XXXXX

Test checks challenge tests against solutions for the following type of challenges:

• html/css/sass
• js
• modern (jQuery, React, Redux, d3)

Solutions for challenges should contain seed code from a challengeSeed section. See for example 9f64fab

[Bouncey]

@ValeraS I can't get the test suit to pass locally, it looks like the test suit fails silently, seemingly at random, mid test.

If I remove the pipe to tap-spec then it looks like all the tests run without error. I even tried swapping put tap-spec for tap-difflet. With tap-difflet, if I pass the -p option so it only logs on failed tests, everything works, but with logging everything makes it fail silently again

[raisedadead]

Let's see if these are random. Here is the master build for this merge https://travis-ci.org/freeCodeCamp/freeCodeCamp/builds/445602013

[ValeraS]

@Bouncey Let's try to use Mocha instead of Tape. Mocha more precisely identify tests. What do you think?