Add scheme syntax highlighting
Rewrite to be more in the style of the lisp syntax
Merge branch 'scheme' of github.com:jpverkamp/highlight.js into scheme
Begin work on inter-relevance for Lisp dialects.
Scheme keywords.
Unified keywords/built-ins styling for lisps.

- "keyword" is the first identifier in a list
- "built_in" is a built-in identifier
- "title" is gone
Normalized scheme.js header
Reindent scheme.js
Detection test for Scheme
Attributing JP Verkamp + noting Lisps unification in CHANGES.md
Merge branch 'scheme'