refactor .loc indexing for slight speedup
Add utility function for using a (packed) dict instead of kwargs
support supplying a packed dict to Dataset.reindex
Support __getitem__ and __setitem__ for arrays with dictionaries
Support dict __getitem__ for Dataset
Add Dataset.loc for dict lookups
Document indexing with dictionaries
Rename cf_decode to decode_cf
fix and simplify TestCFEncodedDataStore
Merge pull request #291 from shoyer/faster-isel

Support using dictionaries for labeled indexing