* SQL scanner: Allow $ signs in SQL identifiers [#164, thanks to jasir and Ben
Basson]
* SQL scanner: Fix open strings [#163, thanks to Adam]
* Ruby scanner: Accept number literal suffixes r and i (Ruby 2.1)
* Ruby scanner: Accept quoted hash keys like { "a": boss } (Ruby 2.2)
* Ruby scanner: Accept save navigation operator &. (Ruby 2.3)
* Ruby scanner: Accept squiggly heredoc <<~ (Ruby 2.3)
* Diff scanner: Prevent running out of regexp stack.
* HTML encoder: You can keep tabs intact now by setting tab_width: false.
* Alpha style: Tweaked colors for :function group with :content.
* File structure: One module per file, autoload CodeRay::Version, paths follow
namespace hierarchy.
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