BUG: fix test_read_LEDA on windows.
Use io.BytesIO() instead of temporary file
Don't add edges from "padding" in sparse6 format
PEP-8 cleanup; attribution
Remove spurious print
Add networkx.tree to setup.py
Ignore .coverage files.
Update travisCI configuration to install networkx first.
Grab path instead of filename.
Python 3 fixes to change directory command. Add some comments too.
Merge pull request #959 from chebee7i/travistree

Update TravisCI configuration and install networkx.tree.
fix error when pickling frozen graphs
Fix error in testing/utils: assert_graphs_equal was not correct for multi graphs
added tests for checking if pickling is working correctly (with different types of graphs, frozen and unfrozen)
Merge pull request #963 from Tscheik/master

Fix error when pickling frozen graphs.
Fix PyPy ordering issue for clique test.
Merge branch 'master' of github.com:networkx/networkx
Fixes networkx/networkx#966 typo in simple_cycles.
Merge pull request #967 from brianthelion/master

Fixes #966 typo in simple_cycles.
Merge pull request #956 from hagberg/sparse6-nodes

Sparse6 format padding fix

Fixes #955