Test harness is no longer maintained; can't run current tests

[dhasenan]

I tried running the tests manually (./run-test262.sh). It fails:

  File "src/test262.py", line 382, in validate
    raise TypeError("Invalid value for negative phase: " + phase)
TypeError: Invalid value for negative phase: parse

Which refers to the line:

if phase not in [None, "early", "runtime"]:
    raise TypeError("Invalid value for negative phase: " + phase)

The test harness has not been updated in two years. The tests themselves are under active development. It would be a good idea to pin the test and harness versions to something reasonable.