Make collection.create() pass the collection object to the callback

[xbill82]

The method kuzzle.collection('foo').create() passed to the callback the response from the server. We estimate that passing the collection makes the API easier to use. It notably allows to do

kuzzle
  .collection('bar')
  .createPromise()
  .then((collection) => {
    return collection
       .createDocumentPromise(...)
  })

Boyscouting

Included kuzzle.createIndex in the promisification whitelist.

[codecov-io]

Codecov Report

Merging #245 into 5.x will increase coverage by <.01%.
The diff coverage is 100%.

@@            Coverage Diff             @@
##              5.x     #245      +/-   ##
==========================================
+ Coverage   98.27%   98.27%   +<.01%     
==========================================
  Files          17       17              
  Lines        2148     2149       +1     
  Branches      610      611       +1     
==========================================
+ Hits         2111     2112       +1     
  Misses         37       37

Impacted Files	Coverage Δ
src/Kuzzle.js	98.76% <ø> (ø)	⬆️
src/Collection.js	98.04% <100%> (ø)	⬆️

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[scottinet]

This needs an update to the SDK documentation and to other SDKs as well

[scottinet]

Nitpicking: this disables the rule for the entire file. Prefer the following:
// eslint-disable-next-line no-native-reassign, no-global-assign