Crc namespace collision

[denniszollo]

The "crc" term in the ephemeris message was colliding with the crc value from the inherited class. This change should avoid the namespace collision by adding an "_" character to each of the amplitude fields. It will break the following:
-- piksi_firmware (when updated to latest libsbp)
-- generated documentation

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[mookerji]

Ah, ok. Would you mind adding adding a few test cases for the ephemeris in the YAML test data?

I can show you an example of how to do that later today: there's a utility in the Python tests directory. The command for doing that is run from the Python client:

PYTHONPATH=. python -m tests.sbp.build_test_data -l data/serial_link_log_20150402-100519.log --version 0.29

[denniszollo]

I think we should update the tool to use JSON log iterator as well

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[denniszollo]

@mfine @mookerji @cbeighley
This is ready for review if you anyone has a second.

[mookerji]

Sweet!

[mookerji]

One second for another look over and I'll go ahead and merge it.

[fnoble]

lgtm, there may be some follow up needed in other modules (piksi_firmware, sbp_log_analysis) as a result of these changes however.

[denniszollo]

I am creating an issue in piksi firmware