Fix 178 realtime notification

[ballinette]

Fix #178

Notification object for realtime/publish action now contains a document attribute, containing a Documentobject with the content of the published message.

[codecov-io]

Codecov Report

Merging #179 into develop will decrease coverage by -0.07%.

@@             Coverage Diff             @@
##           develop     #179      +/-   ##
===========================================
- Coverage    99.39%   99.33%   -0.07%     
===========================================
  Files           16       16              
  Lines         1662     1662              
  Branches       441      441              
===========================================
- Hits          1652     1651       -1     
- Misses          10       11       +1

Impacted Files	Coverage Δ
src/Room.js	100% <100%> (ø)	✅
src/Kuzzle.js	99.45% <ø> (-0.19%)	❌

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