Release Name: beta 0.42

Minor bug fix and minor feature release

New feature:
1) Ledoit-Wolf regularized partial correlation for computing connectivity

1) Changed implementation of mutual information for computing connectivity. Previous version (from Matlab Toolbox for Functional Connectivity) did not scale mean data appropriately, making connectivity estimates dependent on the means of the input data (which it should not be). New implementation applies traditional mean scaling before estimating connectivity. Users may want to recompute mutual information connectivity estimates. 
2) Minor bug in connectivity calculation