Docs running simplified

As suggested in #115, this pull request adds the ability to run the examples in the docs more easily. It adds the same '=' button that is used in general.

Please provide your feedback, I don't have much experience with Prototype and might have dome some parts the wrong way.

Also, the examples which have spaces in them cause this error:

`UnicodeEncodeError: 'ascii' codec can't encode character u'\xa0' in position 22: ordinal not in range(128)`

`\xa0` should be non-breaking space. Not sure what to do here.