Sequelize 4 symbol operators support.

[RichAyotte]

Fixes #585

[codecov-io]

Codecov Report

Merging #606 into master will decrease coverage by 0.88%. The diff coverage is 75%.

@@            Coverage Diff             @@
##           master     #606      +/-   ##
==========================================
- Coverage   95.01%   94.13%   -0.89%     
==========================================
  Files          11       12       +1     
  Lines         381      392      +11     
==========================================
+ Hits          362      369       +7     
- Misses         19       23       +4

Impacted Files	Coverage Δ
src/resolver.js	98.03% <100%> (+0.03%)	:arrow_up:
src/replaceWhereOperators.js	100% <100%> (ø)	:arrow_up:
src/sequelizeOps.js	55.55% <55.55%> (ø)

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[RichAyotte]

@mickhansen Let me know if there's anything that you'd like to see improved before merging. Thanks.

[mickhansen]

Looks good to me, just haven't been around, have you smoke tested this in your own project @RichAyotte?

[RichAyotte]

Yes, it's running with this patch in my project with Sequelize 4.37.10

[mickhansen]

v8.1.3