Looper

Added
- Support for custom summarizers
- Add `allow-duplicate-names` command-line options
- Allow any variables in environment config files or other `compute` sections to be used in submission templates. This allows looper to be used with containers.
- Add nice universal project-level HTML reporting

Changed
- Minor documentation and packaging updates for first Pypi release.
- Fix a bug that incorrectly mapped protocols due to case sensitive issues
- Fix a bug with `report_figure` that made it output pandas code

Changed
- Use independent `peppy` package, replacing `models` module for core data types.
- Integrate `ProtocolInterface` functionality into `PipelineInterface`.

Changed
- Correctly count successful command submissions when not using `--dry-run`.

Changed
- No longer falsely display that there's a submission failure.
- Allow non-string values to be unquoted in the `pipeline_args` section.

Added
- Add `--lump` and `--lumpn` options
- Catch submission errors from cluster resource managers
- Implied columns can now be derived
- Now protocols can be specified on the command-line `--include-protocols`
- Add rudimentary figure summaries
- Simplifies command-line help display
- Allow wildcard protocol_mapping for catch-all pipeline assignment
- Improve user messages
- New sample_subtypes section in pipeline_interface

Changed
- Sample child classes are now defined explicitly in the pipeline interface. Previously, they were guessed based on presence of a class extending Sample in a pipeline script.
- Changed 'library' key sample attribute to 'protocol'