[Imps] Patch to convert test_parser to unittest

[Sam Ruby]

Two attachments: one to convert the existing test_parser.py to use 
unittset (this patch also includes some minor cleanup to 
test_tokenizer); and the other is a master script to run all tests 
(place this script in the tests directory).

As more tests are created, much of this code can be refactored further.

- Sam Ruby
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