add utils and dynamic_import function

qw/utils.py

@@ -0,0 +1,7 @@
+def dynamic_import(name):
+    module, _, function = name.rpartition(".")
+    mod = __import__(module, fromlist=[function])
+    components = name.split(".")
+    for comp in components[1:]:
+        mod = getattr(mod, comp)
+    return mod