[5.x] collection.create can be used with a mapping

[scottinet]

What does this PR do?

The API route collection:create can be used with a mapping since Kuzzle 1.3.0, allowing the creation of a collection directly with a mapping specified: https://docs.kuzzle.io/api-documentation/controller-collection/create

This feature is missing from SDKs, and this PR fixes that for the version 5 of this SDK

Other changes

• Dependencies update (including webpack 1 => 4)
• Fix: mocha now blocks unit tests until the event loop is empty. Some of our unit tests left networking related tasks in the event loop, preventing unit tests to ever finish.
• Update to Sinon 6 and update obsolete usages of that module
• Replace istanbul (obsolete) with nyc

[codecov-io]

Codecov Report

Merging #300 into 5.x will increase coverage by 0.03%.
The diff coverage is 100%.

@@            Coverage Diff             @@
##              5.x     #300      +/-   ##
==========================================
+ Coverage   98.31%   98.34%   +0.03%     
==========================================
  Files          17       17              
  Lines        2138     2118      -20     
  Branches      609        0     -609     
==========================================
- Hits         2102     2083      -19     
+ Misses         36       35       -1

Impacted Files	Coverage Δ
src/Collection.js	98.18% <100%> (+0.14%)	⬆️
src/SearchResult.js	94.54% <0%> (-0.46%)	⬇️
src/eventEmitter/index.js	92.13% <0%> (-0.34%)	⬇️
src/networkWrapper/wrappers/websocket.js	98.61% <0%> (-0.1%)	⬇️
src/CollectionMapping.js	97.67% <0%> (-0.06%)	⬇️
src/Document.js	98.97% <0%> (-0.05%)	⬇️
src/SubscribeResult.js	100% <0%> (ø)	⬆️
src/security/SecurityDocument.js	100% <0%> (ø)	⬆️
src/Room.js	100% <0%> (ø)	⬆️
src/security/Role.js	100% <0%> (ø)	⬆️
... and 8 more

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