Updates fcc crawl for new fcc site

[matthewdking]

fixes #125

Included in this PR:

• new FreeCodeCamp arrays of the challenges the user has to complete
• replace the use of request-promise in the crawl of FCC with puppeteer headless browser. The reason for this was down to the data we needed not being accessible on the first call to the site. If anyone knows a neater way to do it open to suggestions 😄

Will update tests for this in the next few days.

Be good to get this in before FAC15 application deadline (August 17th)

[BartBucknill]

@matthewdking Thanks again for your amazing effort taking this on!

Bit concerned about the performance hit of waiting for the entire freecodecamp profile to load all it's resources before we process the page but I don't have a great alternative. The only alternative I see right now would be to query https://www.freecodecamp.org/api/users/get-public-profile?username=[username] and combine this with the data from https://www.freecodecamp.org/services/map-ui to see which challenges the user has completed. Problem with this is that as this is not a public API it may be changed without warning.

So for now I'm happy to go with Puppeteer. Hopefully one day freecodecamp will sort out a public api and someone will update prereq-check to use it...

[BartBucknill]

@matthewdking I've only been able to do minimal testing, but the code looks good - as soon as the tests are sorted I'm happy to approve the merge.

[codecov-io]

Codecov Report

Merging #126 into master will decrease coverage by 1.88%. The diff coverage is 81.08%.

@@            Coverage Diff             @@
##           master     #126      +/-   ##
==========================================
- Coverage   93.47%   91.59%   -1.89%     
==========================================
  Files          18       18              
  Lines         322      333      +11     
==========================================
+ Hits          301      305       +4     
- Misses         21       28       +7

Impacted Files	Coverage Δ
tests/dummy-data/freecodecamp-html-success.js	100% <ø> (ø)	:arrow_up:
routes/report.js	86.36% <100%> (ø)	:arrow_up:
model/freecodecamp-arrays.js	100% <100%> (ø)	:arrow_up:
model/freecodecamp-crawl.js	76.66% <73.07%> (-23.34%)	:arrow_down:

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