Starting with Backbone TodoMVC to demonstrate how the wordcloud

should be saveable and editable and re-render on changes
fixes #40 for now here is a simple backbone integration

it uses the TodoMVC to save data in local storage for later, and lays the ground work to  how the extra functionality (save as svg and png) could be integrated with someones existing backbone app...

TODOs which this sample shows:
* make the model able to move between the d3 and backbone without data loss... right now its converting the backbone model into an object and sending that to the d3, how could we make it possible to send the actual bacbone model...
* bad practices of loadCloud being global
* something is wrong with the width detection
* the word clouds functions like svg and png export should be exposable
* etc