changed so command line arguments can be provided to configure the bar.

Provided extra command line arguments that can be supplied to configure the bar without having to re-compile it.
A little hacky (global scope variables) but it seems to work well enough.

I kept the original option characters so as not to be confusing to previous configs, as a result some of the new flags aren't that intuitive though.

Here is a screenshot showing bar being called with command line args, htop displaying the exact flags:

https://raw.github.com/mikeyjk/dotfiles/master/arch_bar.png