Remove red-green gem

It doesn't appear to work with MiniTest
Helpers no longer include type attribute

Jammit uses Rails tags_with_options for css tags,
which no longer not includes the `type="text/css"` attribute
Test optional gems against their latest versions
Use double quotes for tag attributes

This way it matches Rails
Convert tests to use MiniTest
rebase to Sass
rebase to MiniTest
"expected" argument comes first on assert_equal

Also convert a few instances of just assert foo==bar to use
assert_equal so a better error message is generated
Setup routes testing controller under Rails 4