Few random cmd2 recommendations

[tleonhardt]

I just took a quick look at the clanvas source code and have a few recommendations regarding the use of cmd2 that you may benefit from:

• Consider loading your resource file via the startup_script optional argument to the cmd2.Cmd initializer
• Consider also specifying a persistent readline history file in the initializer as well
• For commands which use one of the argparse decorators, consider using ACArgumentParser from cmd2 instead of argparse.ArgumentParser - it has several benefits when it comes to automatic tab completion
• As of cmd2 0.9.5, you no longer need to init colorama in your app code, because that is done by cmd2

[rowdyrotifer]

Thanks! Glad to see there are some nice and easy ways to make more improvements thanks to cmd2's simple interfaces.