For now work around by by making our own tag.  Pull request
rails/rails#11707 will correct on next version
of Rails

It doesn't appear to work with MiniTest

Jammit uses Rails tags_with_options for css tags,
which no longer not includes the `type="text/css"` attribute

This way it matches Rails

Also convert a few instances of just assert foo==bar to use
assert_equal so a better error message is generated

When Sass implemented source map support in version 3.4,
the signature of Sass::SCSS::CssParser.new changed to require
3 arguments

Since Rails has not been "booted", it doesn't setup the "url_for" method
which is called internally by the default url_options method.

Over-ridding it with a blank definition allows the controller's methods
to be tested