Documentation v6 and Snippet Tests

[benoitvidis]

What does this PR do?

Imports the SDK v6 documentation in the doc/6/ folder and integrates snippet testing.

How to test?

• npm run doc-testing (you may previously want to docker-compose -f .ci/doc/docker-compose.yml pull)
• go see Travis builds and check if everything is OK

Boyscout

@benoitvidis iz teh dude

[codecov]

Codecov Report

Merging #399 into 6-dev will decrease coverage by 0.01%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##            6-dev     #399      +/-   ##
==========================================
- Coverage   96.31%   96.29%   -0.02%     
==========================================
  Files          32       32              
  Lines        1519     1538      +19     
==========================================
+ Hits         1463     1481      +18     
- Misses         56       57       +1

Impacted Files	Coverage Δ
src/controllers/searchResult/base.js	93.44% <0%> (+0.58%)	⬆️

---

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[codecov-io]

Codecov Report

Merging #399 into 6-dev will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##            6-dev     #399   +/-   ##
=======================================
  Coverage   96.31%   96.31%           
=======================================
  Files          32       32           
  Lines        1519     1519           
=======================================
  Hits         1463     1463           
  Misses         56       56

---

Continue to review full report at Codecov.

Legend - Click here to learn more
Δ = absolute <relative> (impact), ø = not affected, ? = missing data
Powered by Codecov. Last update 34c96e9...aa71e97. Read the comment docs.