A hierarchy of argparse parsers.

Review Request #819 — Created Aug. 1, 2014 and submitted — Latest diff uploaded

benjyw
pants
pants-reviews
patricklaw
Each parser corresponds to a command-line scope (e.g., 'compile.java').

See the code for copious comments.

Note: A future change will contain comprehensive tests for this code's
functionality.
Tests are in a separate change, via a wrapper class that exposes this code's public API.
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