edges should be symmetric
Improve graph validator.  When creating community graph, do not
obliterate weights when community is seen again.
louvain partitioning debug
rebar 2.2
more debugging...
more debugging - fixed weighting of self edges when building community
graph
When adding node back to the same community, use the original weights
dict.  When moving a node from one community to another, carry along
weight of the edge looping back to the node into the indegree for the
node's new community.  Get rid of compiler warnings.
Merge branch 'master' of https://github.com/FlowForwarding/loom
Merge branch 'louvain_debug'