Support for edge multiplicities in non_distributed_betweenness_centrality#2

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javidcf wants to merge 4 commits intoboostorg:developfrom

javidcf:develop

Commits on May 19, 2014

Commits on May 21, 2014

Some other simplification.
javidcf
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Commits on May 23, 2014

Added multiplicity_map parameter to non_distributed_betweenness_centrality
javidcf
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