More unit tests

Copy in a multifile addon for testing, also fix a typo in blenderpack.py

blenderpack.py

@@ -58,7 +58,7 @@ def extract_blinfo(path):
     addon_name = os.path.split(path.rstrip(os.path.sep))[1]
 
     if os.path.isdir(path):
-        with open(os.path.join(path, '__init__.py' 'r')) as f:
+        with open(os.path.join(path, '__init__.py'), 'r') as f:
             source = f.read()
     else: