Release Name: beta 0.40

Feature and minor bugfix release

Minor bugfixes to all stages.
Computation of 5 new connectivity measures (Kendall's Tau, Spearman's Rho, Gaussian copula, t copula, & Frank copula).
Computation and testing of 4 new graph properties (Closeness Centrality, Local Assortativity, Zhang & Horvath's Clustering Coefficient, & a version of the Clustering Coefficient that incorporates the sign of the weights to determine how much unique influence a node has).