Use @require and other decorators to simplify code imports/checking
Return matrix instead of array for laplacian functions
Whitespace cleanup and formatting
Refector conditional so there is only one return
Trailing whitespace.
Implement parse_graphml()

Similar to other formats (e.g., 'parse_gml()'), provide for parsing
graph out of graphml stored in a string (not a file, as is currently
done by 'read_graphml()').
Fix typo in docstring (copy/paste error).
Add tests for parse_graphml() where appropriate.
Merge pull request #840 from cianci/parse_graphml

Implementation of missing function "parse_graphml()"
Use node id in edges if specified as attribute
Remove node 'label' attribute if relabel=True
Whitespace cleanup. Formatting.  Copyright.
Merge pull request #844 from hagberg/842-gexf

Fix id specification for GEXF writer edges
Correct iteration count in pagerank convergence message
Merge pull request #850 from hagberg/pagerank-message

Correct iteration count in pagerank convergence message
add weight to astar_path_length's call to astar_path
Merge pull request #871 from tdihp/patch-1

add weight to astar_path_length's call to astar_path
Bug writing shapes in GEXF format
Merge pull request #875 from hagberg/gexf-shape

Bug writing shapes in GEXF format
Fix import error and typos in scc tests