"disable" yaml for pep8 is not honored

[jquast]

.prospector.yaml:

pep8:
    run: true
    disable:
        - N802

test.py:

def MyFunc():
    pass

$ prospector --tool=pep8 test.py
Messages
========

test.py
  Line: 1
    pep8: N802 / function name should be lowercase (col 5)



Check Information
=================
       Started: 2015-01-09 18:05:50.651303
      Finished: 2015-01-09 18:05:50.653521
    Time Taken: 0.00 seconds
     Formatter: grouped
    Strictness: from profile
Libraries Used:
     Tools Run: pep8
 Message Found: 1

seems to work fine for pylint, and frosted, however.

[carlio]

Not quite sure when this started happening, but #96 fixes it.