Fixed import in main.py so this can be used for debug and test during development

Author: tleonhardt

main.py

@@ -1,12 +1,11 @@
 #!/usr/bin/env python
 # coding=utf-8
-
-from cmd2 import Cmd
+from cmd2 import cmd2
 
 if __name__ == '__main__':
     # If run as the main application, simply start a bare-bones cmd2 application with only built-in functionality.
 
     # Set "use_ipython" to True to include the ipy command if IPython is installed, which supports advanced interactive
     # debugging of your application via introspection on self.
-    app = Cmd(use_ipython=True)
+    app = cmd2.Cmd(use_ipython=True)
     app.cmdloop()