minification

minified versions of css and js files; introduced version var to reduce changes in the code on version bump

- CodeMirror JS created here: http://codemirror.net/doc/compress.html
- non-CodeMirror JS minified with: http://refresh-sf.com/yui/ (Options: "Minify only, no symbol obfuscation" = true, all others default ) (YUI Compressor 2.4.8)
- CSS minified with: http://www.minifycss.com/css-compressor/ (Options: all defaults; Compression (code layout): Highest)

Introduced $version to make the version # easier to change for all non-CodeMirror assets