Fix BAAPB resolver implementation

Author: haydenmccormick

utils.py

@@ -1,13 +1,16 @@
 from mmif.serialize.annotation import Text
 from flask import current_app
 import cache
+import mmif_docloc_baapb
 
 
 def url2posix(path):
     """For the visualizer we often want a POSIX path and not a URL so we strip off
     the protocol if there is one."""
     if str(path).startswith('file:///'):
         path = path[7:]
+    elif str(path).startswith('baapb://'):
+        path = mmif_docloc_baapb.resolve(path)
     return path