simplification of css templates

Since we are using `rizzo` headers we get: 
```
<!--[if IE 7]><html class='no-js ie7 no-freight base ' data-topic="" lang='en'><![endif]-->
<!--[if IE 8]><html class='no-js ie8 no-freight base ' data-topic="" lang='en'><![endif]-->
<!--[if IE 9]><html class='no-js ie9 no-freight base ' data-topic="" lang='en'><![endif]-->
<!--[if gt IE 9]><!--><html class='no-js no-freight base ' data-topic="" lang='en'><!--<![endif]-->
```
And therefore can target browsers as:
```
.ie8 
  selector
    property: value 
```

To verify 
- point Gonzo to a local Beaker 
- run `rails g beaker:marketing new_york_test` 
- run gonzo and visit `/new-york-test`
- make sure you get no 404's in console