Make all Kuzzle constructor options writable

[benoitvidis]

Description

In some circumstances, we may want to use the same kuzzle object and change its options, for instance to switch to another environment.

This PR allows to update any possible option given to Kuzzle constructor.

Notably, this allows to switch the connection mode back from or to ssl on the current kuzzle instance, without having to create a new object.

Linked issue

kuzzleio/kuzzle-admin-console#154

Linked PRs

• Make all options given to kuzzle constructor writable #188
• KZL-747 algolia on doc v2 documentation#113

[codecov-io]

Codecov Report

Merging #189 into master will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master     #189   +/-   ##
=======================================
  Coverage   99.39%   99.39%           
=======================================
  Files          16       16           
  Lines        1665     1665           
  Branches      441      441           
=======================================
  Hits         1655     1655           
  Misses         10       10

Impacted Files	Coverage Δ
src/Kuzzle.js	99.45% <ø> (ø)	✅

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