Regen work, should be better now, tagger enhanced dep tracking

I think I have regen working the same, and possibly better than it was
before.

The tagger extension should have better dependecy tracking now. Pages
that make use of site.post from the tagger extension aren't picked up,
and I can't figure out a good way to track this in the current form.
Removing CoffeeScriptTransformer and RestructuredtextHandler

We're getting rid of Nokogiri, seems like not many people are using
these anyway, and RestructuredtextHandler requires rst as well, which
we don't want to depend on anyway.
Further removing rst handler
Removing Nokogiri from list of dependencies

Nokogiri is now only needed for development (testing actually).
Fixes #441 livereload by default for auto & dev

Livereload is enabled by default if your are using -a, --auto, -d or
--dev. I figured if you're going to be auto regen on changes, you might
as well use livereload as well.
Fixes #419 showing drafts in development

This should make draft posts show up.
Merge pull request #442 from LightGuard/master

More work toward 0.5.6