Flux todomvc enhancements from justin

2 minor changes:

1. Enable react chrome dev tools.
2. Smaller methods.
I personally prefer explicitness (and tends to be the FB preference as well). More lines of readable and understandable code > a single line of magic code. Longer than 10 lines is totally fine. I get the desire for short methods and most of the time it is a good idea. There are tradeoffs and I think for this case, it's much easier to follow the lifecycle if you keep the things happening only in render in render itself.

Let's keep lodash out of here too. The point, especially in an example application, is that it's understandable by all. Understanding what that line of code does when you don't know lodash/underscore takes unnecessary effort.