version bump
Change sink* family of functions according to issue-14.

Add additional parameter that shows is the underlying data
structure should be closed.

Also documentation were improved.

X-Reported-By: Michael Snoyman
X-Bug-Url: https://github.com/wowus/stm-conduit/issues/14
Clarified the documentation.
Merge branch 'issue-14'

Conflicts:
	stm-conduit.cabal
Add a bufferToFile function in Data.Conduit.Async