Fix link to point to new RefineryCMS repo

I feel this is too detailed for the guide. Most of that is not public interface,
and if tomorrow something is added or removed in those chains we do not want
to come here to maintain it. Also, linking to a gist is not a good idea in a guide.

We could have a more broad description of what goes in what order, the most key and
public things.

This reverts commit 862a05ed.

Add --rc option to support the load of a custom rc file

Remove BestStandardsSupport References

Starting a line with an octothorpe makes an <h1>

so that the tester's local .railsrc file does not affect the test results

Add --no-rc option to skip the loading of railsrc file

Use \A in Regexps

Convert int, float, and bools from ENV['DATABASE_URL'] query args

the strings true and false into boolean types, in order to match how
YAML would parse the same values from database.yml and prevent
unexpected type errors in the database adapters.

So, if there is redirect_to params[:q]
i can send ?q=javascript:asdf()%0A/localpath
Or something more nasty, so please use \A

Raise an exception with a useful message if a rake task is requested for an unknown adapter

class_eval should use __FILE__ and __LINE__