Add set up function for pipelines.

[robertdstein]

Close #869 and close #871

Setup now occurs when a pipeline is instantiated. Right now this means DB setup for affected pipelines, but this function can also include any other arbitrary set up code.

[coveralls]

Pull Request Test Coverage Report for Build 9202309961

Warning: This coverage report may be inaccurate.

This pull request's base commit is no longer the HEAD commit of its target branch. This means it includes changes from outside the original pull request, including, potentially, unrelated coverage changes.

• For more information on this, see Tracking coverage changes with pull request builds.
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• For a quick fix, rebase this PR at GitHub. Your next report should be accurate.

Details

• 34 of 37 (91.89%) changed or added relevant lines in 7 files are covered.
• No unchanged relevant lines lost coverage.
• Overall coverage increased (+0.02%) to 83.637%

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Changes Missing Coverage	Covered Lines	Changed/Added Lines	%
mirar/pipelines/summer/models/init.py	10	11	90.91%
mirar/pipelines/winter/models/init.py	10	11	90.91%
mirar/pipelines/wirc/wirc_files/models.py	3	4	75.0%

Totals
Change from base Build 9181604841:	0.02%
Covered Lines:	10989
Relevant Lines:	13139

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💛 - Coveralls