Fix Order by (and Issue 81 onsnapshot implementation)#145

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BrianChapman wants to merge 8 commits intosoumak77:masterfrom

BrianChapman:orderBy-onsnapshot-merge

Commits on Jan 23, 2019

Add onSnapshot functionality to doc, collection and query
BrianChapman
committed
onSnapshot should call callback if no data changed and includeMetadataChanges is true.
BrianChapman
committed

Commits on Jan 25, 2019

Move onSnapshot handers to the queue so that a call to flush will call the onSnapshot callbacks no mater where the flush is called from.
BrianChapman
committed

Commits on Apr 24, 2019

Commits on Apr 25, 2019