Merge pull request #2 from acrosby/master

Adding PyTest class in setup.py so that the pyugrid library is install-able with setup.py based tools
added code to generate the face_face connectivity array

added simple wxPython-based ugrid viewer
Merge branch 'master' of https://github.com/pyugrid/pyugrid

Conflicts:
	pyugrid/ugrid.py

jsut a shift to the IND_DT dtype specification.
added build_edges method.