Provide aliases for filter/pipe

[aalmiray]

Fix for #165

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This change is 

[coveralls]

Coverage remained the same at 55.942% when pulling 218ffab on aalmiray:pipe-filter-aliases into 2db9cde on jdeferred:master.

[aalmiray]

Decided to bite the bullet and remove the "duplicate" versions of then and leave filter and pipe instead, given that this release already breaks binary compatibility.

[aalmiray]

Do we need a method like the following one?

	<D_OUT, F_OUT> Promise<D_OUT, F_OUT, P> pipeFail(
	FailPipe<? super F, ? extends D_OUT, ? extends F_OUT, ? extends P> failPipe);

[saturnism]

was this the last pr we needed to merge for 2.0? :D

[aalmiray]

Yes, this is the one. All other PRs can wait post 2.0 IMHO

[saturnism]

thanks!

[saturnism]

Reviewed 1 of 6 files at r1, 12 of 12 files at r2.
Reviewable status: complete! all files reviewed, all discussions resolved