See mongodb#1148

Fixed 32-bit integer overflow by allowing UTCDateTime() to get it's o…

…wn current time (mongodb#1127)

Fix compatiblity with 5.3

Remove php cs cache file

Fixed issue mongodb#1002 and mongodb#1013 (mongodb#1025)

Ditch extract, update tests and fixes mongodb#1012

Aggregate subdocument arrays (mongodb#918)

* add sub document aggregation array functionality

example:
    Model::sum('subarray.*.price');

this method is much simpler as to use as complex raw aggregations

for this function a $unwind directive will be pushed in pipeline before $group

* change testSubdocumentArrayAggregate

change test for different scenarios

* rebase to latest master and fix style ci issues

Filling with Dot-Notation (mongodb#926)

* Filling with Dot-Notation Keys

Simply override `removeTableFromKey($key)` method and  just return original keys in order to support dot-notation when calling `fill` on model.

* Style CI

* Dot-Notation Fill Tests

Merge pull request mongodb#930 from pi0/UnitTests

5.3 UnitTests

Merge mongodb#769