Fixes Bug 865791 - skunk classifier system added to processor

this PR adds the skunk classifier system to the processor.  It is implemented on top of the existing TransformRule  system.  The changes consist of three major parts:

1) the addition of code to translate MDSW pipe dump output into the forward looking jsonMDSW form.  I'd like :ted to take a look at `socorro/processor/breakpad_pipe_to_json.py` and ` socorro/unittest/processor/test_breakpad_pipe_to_json.py`

2) the skunk classifiers themselves.  I'd like :bsmedberg to look at: `socorro/processor/skunk_classifiers.py` and `socorro/unittest/processor/test_skunk_classifiers.py`

3) changes to `socorro/processor/legacy_processor.py` and `socorro/unittest/processor/test_legacy_processor.py` to use the new parts introduced in 1 & 2