Better detection for Foundation

- Detected 17 websites from a [list of 30 websites using Foundation](http://zurb.com/responsive?framework_id=1) (previously only detected 7)
- Only detects websites using Foundation 4 and above (new small-x, medium-x, large-x syntax)
It still seems broad but perhaps it's enough. Avoid the dot character in HTML patterns in order to not match plain text though and use non-capturing groups where possible. I think this will work:

`<div [^>]*class=\"[^\"]*(?:small|medium|large)-\\d{1,2} columns`