Support running the pipeline in a docker container
Breakdown enrollments by mode
Replaced "localhost" with "hadoop" in order to support fig
Merge pull request #38 from edx/gabe/docker-experiment

Support running the pipeline in a docker container
Merge pull request #39 from edx/gabe/enrollment-mode

Support enrollment mode breakdowns
Add tests for enrollment validation event creation.

Also change event_output to tuple_output, and make event output the
default.  (Tuple output is still the primary output format for tests.)

Trigger a student_courseenrollment dump when interval includes today.

Add EnrollmentValidationWorkflow to combine a dump and validation.
Add acceptance test.