update syntax highlight after editing (#210), move markdown and highlight scripts from lib to plugin

Using the latest Uglify JS with --no-seqs and deleting 'use strict' statement for use in production.

Conflicts:
	js/reveal.min.js

Need to generate a new minified version afterwards.

Its was impossible (at least for me) to keep the windows in sync without bloating the code too much.

Using the latest Uglify JS with --no-seqs and deleting 'use strict' statement for use in production.

Change source from reveal.min.js to reveal.js for testing purposes.

Add nextFragment and previousFragment to the API:
Making it possible to call the methods Reveal.nextFragment()
and Reveal.previousFragment() from »outside«.

Update README.md:
Add the new API Methods Reveal.prevFragment() and Reveal.nextFragment()