Check directly for elements in dictionaries, not their .keys()
Iterate directly over dictionaries, not their .keys()
Merge branch 'master' into remove-keys
Add support for the context manager protocol to netcdf_file objects
Merge pull request #491 from timleslie/netcdf-context-manager

ENH: io: Add support for the context manager protocol to netcdf_file objects
Merge pull request #490 from timleslie/remove-keys

MAINT: Remove redundant use of .keys()