KGML_pathway.py: pep8 compliance changes
KGML_pathway.py: Noted colour assumptions in Graphics.element
KGML_parser.py: pep8 compliance modifications
test_KGML_graphics.py: Added test that imports the map associated with the KGML from KEGG.

In release 1.65, there was a typo bug that broke drawing from KGMLCanvas
when the imagemap was imported from KEGG. The new test checks that import
of the map from KEGG still works.
test_KGML_graphics.py: Reformatted docstrings for PEP 257 compliance
test_KGML_graphics.py: Added format string for RST, and pep8 compliance changes