Allow selective reversion of fields in revert() Parse Object instance method.

[omairvaiyani]

E.g. currentUser.revert(‘name’) or movie.revert([‘totalReviews’, ‘totalViews’]);

Improving on this issue request

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[codecov-io]

Codecov Report

Merging #249 into master will increase coverage by 0.97%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##           master     #249      +/-   ##
==========================================
+ Coverage   84.35%   85.33%   +0.97%     
==========================================
  Files          46       46              
  Lines        3663     3736      +73     
  Branches      835      859      +24     
==========================================
+ Hits         3090     3188      +98     
+ Misses        573      548      -25

Impacted Files	Coverage Δ
src/ParseObject.js	86.13% <ø> (-0.32%)	⬇️
src/ParseQuery.js	94.57% <0%> (-0.01%)	⬇️
src/ParseError.js	100% <0%> (ø)	⬆️
src/ParseFile.js	82.35% <0%> (+0.98%)	⬆️
src/LiveQueryClient.js	86.95% <0%> (+1.86%)	⬆️
src/ParseLiveQuery.js	80% <0%> (+37.89%)	⬆️

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[ghost]

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[flovilmart]

@omairvaiyani can you address the conflicts and also, restore the gitignore file and remove the lib folder please?

[omairvaiyani]

@flovilmart I'm closing this PR as it's a bit of a mess - re-opened with a clean PR, and test-cases #565