Merge pull request #24 from Tobias-Fischer/feature

Added PatternCoordinator class, which returns a set of coordinated pattern generators.  

Also changes the default of imagen.Selector, but we do not expect this to be a problem given how arbitrary the default was before and thus how unlikely it was that anyone is relying on the default.
Updated param submodule reference
Cleaned up docstrings, comments, and spacing
Added reponame argument to __version__
Deleted trailing whitespace
Fixed pyflakes import errors
Fixed pyflakes warning regarding param being shadowed by loop variable
Updated nbpublisher submodule reference
Updated dataviews and param submodule references
Updated submodule references
Updated nbpublisher submodule reference
Updated param submodule reference
Updated dataviews submodule reference
Updated ViewOperations to accept optional key argument
Changed inherent_features to be a list, the former dictionary is now in placeholder_mapping
Allow path to dataset rather than JSON file, allow glob in filename_template (both PatternCoordinatorImages)