RF: remove unused Guimera modularity code
NF: method in GraphPArtition to check that index is a dict containing sets
NF: clear error raised if index does not contain all possible nodes
NF: added tests for new type checking methods of GraphPartition, and check that index is a dict
BF: fix modularity test passing index as improper type (list), and removed some cruft
RF: clean up 1/0 a bit, preparing for _check_integrity
Merge pull request #4 from cindeem/edits

GraphPartition value checking and cleaning