super preliminary support for multiprocessing streamlines
small mpl bugfixes (unbound vars)
clean trailing whitespace
make setup.py python 2.6 compatible
include active state ordered dict recipe for python 2.6 compatability
python 2.6 compatibility: remove xpaths in xdmf reader
quiet linter warning for relative import in xdmf
add changelog
small python3 compatibility changes
Call out Python 2.6+ as a dependanty in readme