Add docstring and todo note

spacy/util.py

@@ -107,6 +107,13 @@ def read_json(location):
 
 
 def parse_package_meta(package_path, package, require=True):
+    """
+    Check if a meta.json exists in a package and return its contents as a
+    dictionary. If require is set to True, raise an error if no meta.json found.
+    """
+    # TODO: Allow passing in full model path and only require one argument
+    # instead of path and package name. This lets us avoid passing in an awkward
+    # empty string in spacy.load() if user supplies full model path.
     location = package_path / package / 'meta.json'
     if location.is_file():
         return read_json(location)