Gherkin support

Hacked into shape from this
https://github.com/cucumber/gherkin-syntax-highlighters
Ignore RubyMine cruft
Capture do, end, /^step def text$/
Gherkin test (I think)
Gherkin done
Step Defs

I think this is a bit simplistic, but it works
Gherkin definition
Merge branch 'feature-gherkin' of github.com:matteofigus/highlight.js into gherkin

Conflicts:
	.gitignore
Tuning Gherkin relevance:

- reset custom relevances in Gherkin
- zeroed relevance of the common phrasal word "the" in AppleScript
Moved Gherkin snippet to the end of tests, removed step_definitions snippet.
merge + step_definition removed from tests
css classes reference added
Merge branch 'feature-gherkin' of github.com:matteofigus/highlight.js into gherkin

Conflicts:
	.gitignore
	src/test.html
Merge branch 'gherkin'