introduce socket workflow with fail sematics

getting rid of the exception handlers and failing properly on socket
errors
correct try-catch
del space
implements a more secure in-process session state provider; see also ref #49
delete left over
getting rid of web_part_timeout, ref #98; we should leave it up to the WebPart to timeout - in that direction we introduce a new combinator timeout_webpart
bring this program up to date
release all buffer segments in the scope before failing
Merge pull request #113 from SuaveIO/feature/monadic_socket

Feature/monadic socket