Remove 0.2

I vote to remove support for version 0.2.0. It leaks memory and doesn't support config key `advertise`, which I'd like to support in an upcoming pr.
More importantly, the ui zip of 0.2.0 is packaged differently that 0.2.1, so we would have to put in more machinery to differentiate the way we install it based on the old version number.

This is the first of a series of pull requests that all build on top of each other, I'm trying to package them individually, but that's not really possible.

Maybe you want to take a look at my master at https://github.com/bkw/consul-cookbook/tree/master, if you like all the changes, I could just prepare one large PR. What do you think?