Post-qa

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- Add --[no-]probe-git flag

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- Improved error handling

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- Updated README

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- Upload validate_base blobs, measurement metadata and metric definitions to SQUASH
- --api-url cmd line option now points to SQUASH API root URL (e.g https://squash.lsst.codes/dashboard/api/)
- Removed --metrics cmd line option, metric definitions are upload dynamically now
- Added Travis set up for PyPI deployment

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- Add --metrics CLI flag: allows us to customize what metrics are submitted from the command line invocation.
- Also removes AM3 from the default upload list.
- Omit measurements with None values from upload: needed for SQUASH API compatibility.
- Raise and print any requests exceptions when posting to the SQUASH API.
- Centralize dependencies in setup.py.

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- Add ``--test`` option to print the shimmed JSON without uploading it.
- Update test JSON from ``validate_drp`` based on `DM-7933 <https://jira.lsstcorp.org/browse/DM-7933>`_.