fixing weighted_atom tests -- should add bound and lagrange for existing norms
fixed bug in group_lasso -- was giving the lagrange a default value of 1; better naming in mixed_lasso_cython; removed code to store SVD -- should use partial_svd;
making sure SVD cones get matrices
doc template cleanup
added a second check for the subgradient
simplifying group_lasso epigraph
group_lasso tests