Merge pull request bottlepy#213 from fredj/load_app-load

Fix NameError exception in load_app (_load call)

bottle.py

@@ -2164,7 +2164,7 @@ def load_app(target):
         does not affect the current default application, but returns a separate
         application object. See :func:`load` for details. """
     tmp = app.push() # Create a new "default application"
-    rv = _load(target) # Import the target module
+    rv = load(target) # Import the target module
     app.remove(tmp) # Remove the temporary added default application
     return rv if isinstance(rv, Bottle) else tmp