TST+DOC: use doctest format in module documentation of datasets.cosmo, as suggested by Yarik + add small matlab .mat test files
TST+DOC+DATA: use doctest format in module documentation of datasets.cosmo, as suggested by Yarik. Added .mat test data files with dataset and neighborhood in CoSMoMVPA format
RF+BK: clear the feature and dataset attributes when updating the output dataset from CosmoSearchlight
ENH: prettier formatting of CosmoQueryengine that is more similar to that of Dataset