Highlight issue counts for each framework implementation

**NOT READY TO MERGE**

I think we have a small problem at the moment where the issues for a given ToDoMVC implementation are not terrible visible. If they were highlighted more clearly I am sure it would make it more likely for framework 'advocates' to come forward and fix them.

My proposal is to add some form of issue count to the 'learn' section.

I have very much hacked a quick example together. You can see it live just for 'olives' here:

http://colineberhardt.github.io/todomvc/examples/olives/

![screen shot 2014-10-16 at 22 51 42](https://cloud.githubusercontent.com/assets/1098110/4671235/ae3aadaa-557e-11e4-99c4-b8a192eed7e1.png)

@tastejs/owners - what do you think? Is this worth pursuing further?