Add the framework for running a test
Follows a PHPT-esque style of test definition. At the moment, the only supported parts are FILE (required) and PASS (1 or 0, if set). The FILE part is written to a temp file, hh_server --check is run, then the file is deleted. PASS is currently checked based on the exit code of hh_server, with 0 being passed, 1 being failed to typecheck and anything else being a failure.
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