fixes, refactoring, add new langs

git-svn-id: http://plugins.svn.wordpress.org/prettify-code-syntax/trunk@673872 b8457f37-d9ea-0310-8a92-e5e31aec5664
fix lang load bug, refactor, isolate default style, add Bootstrap style
Merge branch 'master' of github.com:jesucarr/wordpress-prettify-code-syntax