Don't filter files with the compass filter that don't have either scss or sass file extension. Fixes #72.

compressor/filters/compass.py

@@ -18,6 +18,9 @@ class CompassFilter(CompilerFilter):
     def input(self, *args, **kwargs):
         if self.filename is None:
             self.filename = kwargs.pop('filename')
+        if not (self.filename.lower().endswith('scss') or
+                self.filename.lower().endswith('sass')):
+            return ''
         tmpdir = tempfile.mkdtemp()
         parentdir = path.abspath(path.dirname(self.filename))
         self.cwd = path.dirname(parentdir)