Overrides "in" operator for Hash.
fix remove in simple transform so it works with more than one field (+test)
Flow related transformations (sort, sortedjoin, split).

Created new transformations for doing multi input/output flow related
operations. Software sorting of a stream (not recommended unless you're certain
of the relative smallness of your stream), flux splitter (route messages on
various outputs depending on the result of a condition), sorted join (join two
streams sorted on the same key using a 'merger' function.

Fix a bug on InputMultiplexer.get() when more than one input is used, add unit
tests for it.
Update travis configuration so it runs the flow example.
Fix insert_sorted bug brought by refactoring (length to end useage to store the working range).
Tries to make the sorted join work (at least let us thing it does).
add unit tests for our Hash class.
update simpletransform helper to go towards a more pythonic interface for hashes, update hash test to method names does not override.
removes pobject, switch to nicer doc theme. [DEFUNCT]
fallback to default if not available
removing pobjects, not compatible with alternate python implementations and crappy license
tries to add pypy travis support
Simpler than zope.interface, use of abc.ABCMeta. Documentation, still a lot of work on this side.
prepare release 1.0.0.a3
Merge branch 'dev'

Conflicts:
	doc/conf.py