Simplify make_str() for Py3.
Merge remote-tracking branch 'upstream/master' into hagberg/json-str
Remove normalization option to current_flow_closeness

Update docs
Fix failing test
Update nose configuration to include coverage.
Do not include coverage from networkx.external
Adjust regex for test discovery.
Now, networkx.testing is not considered a test.
Copy nose configuration to installation directory before testing.
Better comments about TravisCI installations.
Clean up comments a bit more.
Attempt to submit coverage only for 2.7
Merge pull request #993 from chebee7i/coverage

Make nose and coveralls coverage levels match.
Fix to follow PEP8

Fixed by using autopep8: `autopep8 --in-place --aggressive
pagerank_alg.py`. Looks like it mainly fixed spaces around operators,
and the use of two spaces before a comment.
Minor fixes in the docstrings
autopep8 on tests/test_pagerank.py
Add dangling_edge parameter to google_matrix
Fix import ordering
Add spaces to some multiline strings
Add a test for dangling nodes
Implement and test dangling nodes for pagerank