Use TodoMVC for example

Most people are familiar with the TodoMVC project. Using it for an example
reduces the amount of CSS/HTML work that needs to be done and it provides a
better reference point for people who are trying to understand the architecture
of Mimosas (and Smalltalk MVC).

* Separate controllers and views by function as it is more in line with Smalltalk's approach
* Begin implementing controller functions for single todo items
* Move example-specific bower components into the todos directory
* Remove old 80s example, which was todally radical but not as helpful
* Update the controller context to check the element for the selector, not just children
* Add .vimrc file to enforce spaces instead of tabs