DataSnapshot child and forEach type improvements
#37
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2) allow overriding child data type
This change allows snap.child('prop') to inherit the type of `prop` set in parent snapshot's type, and `snap.child<number>('some_number')` to explicitly set the child type
Only allows a number for the child index to be passed
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In addition to @futurGH's great work to implement type generics in #34, I improved the types of the
DataSnapshot.child,DataSnapshot.forEachandMutationDataSnapshot.childmethods