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Fix operators that may stall when cold sources aren't receiving P… (#60)

* Fix synchronous make Close signal

* Continue allowing Pull/Close/Push on inner mergeMap sources

*  Continue allowing Pull/Close/Push on switchMap's inner source

* Continue allowing Pull/Close/Push on concatMap's inner source

* Fix missing Pull in mergeMap and add merge source test

* Implement alternative passesSourcePushThenEnd suite

This is for eager operators that send an additional
Pull signal when they're not expecting one to come
in from the sink. All {merge,switch,concat}Map operators
need to pass this instead of passSourceEnd.

* Add active pulling to sample

sample needs to also actively send Pull signals as
it may not forward any that will cause Pull signals.

* Add active pulling to buffer

* Add active pulling to takeUntil

* Ensure merge sources are instantiated first

Ensure that all merge sources are eagerly pulled
and started without hanging and waiting for the
first source.

Before `merge` and `mergeMap` would behave like
`concat` and `concatMap` when the first source
wouldn't push or end.

* Fix timing of eager pull in mergeMap

* Add test for interval source to merge source

* Revert change to make teardown

413 of 466 branches covered (88.63%)

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866 of 934 relevant lines covered (92.72%)

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