Add a get_rank() method to OptionValueContainer.

Review Request #2431 — Created July 1, 2015 and submitted — Latest diff uploaded

benjyw
pants
76d9610...
pants-reviews
jsirois, patricklaw
It returns the rank of the value at the specified key.
This will be useful in another change I'm working on that
reworks the option help system.

Unit tests pass locally. Full CI passed here: https://travis-ci.org/pantsbuild/pants/builds/69067709.

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