Added global setting `suppress-responsive` which aims to tame older web ...

PR in response to issue #44.
@declandewet I agree completely and have renamed the global variable to 'suppress-modern-queries'.

I have merged some tests that @007design has kindly provided.

However, the tests all fail as soon as I add the following:
```stylus
rupture = {
   suppress-modern-queries: suppress-modern-queries
...
```
and then using the following elsewhere in the script:
```stylus
   ... rupture.suppress-modern-queries ...
```

Any suggestions?