Fix import error and typos in scc tests
Merge pull request #3 from hagberg/scc-import

Fix import error and typos in scc tests
Merge branch 'master' of github.com:hagberg/networkx
Check for dot_parser to catch error importing pydot
Whitespace cleanup/formatting
Merge pull request #905 from hagberg/pydot-test

Pydot test fixes