Added data-api support so it can also be used in a similar manor to a Bo...

Stumbled upon this plugin this afternoon and have to say I love it.

We're big users of Twitter Bootstrap here, all plugins of which use the data-api as the first class method for activating the plugin, rather than programmatically enabling it.

I've added support for this kind of activation to stickychimp and updated the docs appropriately.

Look forward to hearing your thoughts.

Rob