started random walk graph
added dd model generator
Merge branch 'master' of https://github.com/wangz10/networkx
Merge remote-tracking branch 'upstream/master'
added DD model
added DD graph to __all__
added unit test for duplication_divergence_graph
cleaned up left over codes
modified the range of allowed retention probability
modified the range for retention probability to (0,1] in the exception message
fixed typo...
MAINT: scipy sparse matrix conversion to networkx graph format
MAINT: weighted edges
ENH: speed up some scipy sparse conversions
Only rescale if fixed is None
MAINT: range -> xrange for scipy matrix conversion
MAINT: remove iteritemz, izip, and xrange from networkx scipy sparse conversion
Fix PEP8 issues in nx.utils.rcm
Fix Cuthill-McKee ordering examples
Avoid quadratic behavior in connected_cuthill_mckee_ordering