Added skeleton of work

Not a working implementation! Still working with the inline rules and
whatnot.

Also adds the 'indent_styles' rules and test, incomplete. All a work in
progress.
I'm not sure this is more useful than the execRules method. Also, this introduced another iteration over rules. I'm not sure if this is a good direction atm. At the very least, I think filterRules would be a better name.