example element

http://redmine.oerpub.org/issues/364

this is very much a copy/paste from the note plugin. examples and notes are similar enough at the moment that they could almost be the same pluign. but kathi convinced me that because of future plans and desire to not have one plugin to rule them all we should make them separate. that said having this much copy/pasted code isn't exactly ok with me and i'm only doing it in the interest of shipping code for the upcoming sprint. i think we should have a very serious conversation about our plugin architecture post-sprint to make it easy to mix/match functionality that the different blocks have