beforeSave changes should propagate to the response

[gfosco]

For issue #457

[codecov-io]

Current coverage is 91.66%

Merging #865 into master will decrease coverage by -0.02% as of 67008cb

@@            master    #865   diff @@
======================================
  Files           71      71       
  Stmts         4102    4105     +3
  Branches       845     846     +1
  Methods          0       0       
======================================
+ Hit           3761    3763     +2
  Partial         10      10       
- Missed         331     332     +1

Review entire Coverage Diff as of 67008cb

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[nlutsenko]

Looks good, though this is a hack and I feel we need to find a better way for this information. Or rebuild the flow here slightly to support this.

[mmazzarolo]

Hi!
Just to let you know, it seems it didn't fix #866, on parse-server 2.1.5 changes are still not propagated to response.