[dev] [ii] patch - handle arguments a little better

Hello,

Small patch so ii will give usage information instead of running when
the user enters a wrong flag, doesn't supply an argument to a flag, or
supplies an argument without a flag. It doesn't add any SLOC and
simplifies one. Just happened to find out ii didn't handle incorrect
flags well when i tried 'ii -v' to get version information.

-emg