Add initconfig support for command defaults, allow strings as config keys

[hyperbolist]

Fixes #63

The initconfig command will now write out all of the switches and flags for any commands and any subcommands. It writes config keys as strings, though symbols will still work.

[davetron5000]

Thanks for doing this! Other than the issues with monkeypatching, the overall change looks great!

[hyperbolist]

Got rid of the monkeypatching, which I admit was reckless.

[davetron5000]

Thanks and sorry for the delay in looking at this. Just one tiny nitpick, but otherwise this looks good. Thanks!