[#20288] Update the CodeRay Ruby syntax highlight example. This commit changes the following: * Remove line numbering from syntax highlight example. * Add span with 'CodeRay' class around the syntax highlight example. * Fix span classes in the syntax highlight example: ** Ruby scanner changed from ':reserved' to ':keyword' with CodeRay 1.0.0. * Remove obsolete line numbering styles. * Fix internal stylesheet to match CodeRay 1.1.0 (preserving r10132's changes). * Sort internal styles and remove superfluous newlines between styles. Contributed by Mischa The Evil. git-svn-id: http://svn.redmine.org/redmine/trunk@14492 e93f8b46-1217-0410-a6f0-8f06a7374b81