parser: pre_filter is not run in _get_data

[danielrichman]

diff --git a/habitat/parser.py b/habitat/parser.py
index 5435093..27739d8 100644
--- a/habitat/parser.py
+++ b/habitat/parser.py
@@ -228,6 +228,8 @@ class Parser(object):

     def _get_data(self, raw_data, callsign, config, module):
         """Attempt to parse data from what we know so far."""
+        raw_data = self.filtering.pre_filter(raw_data, module)
+
         sentences = config["payload_configuration"]["sentences"]
         for sentence_index, sentence in enumerate(sentences):
             if sentence["callsign"] != callsign: