Update Brunch with Chaplin.

1. Add Bower integration. Since Brunch automatically concatenates all Bower stuff, we don’t need bower_components in repository (added to .gitignore, except of todomvc-common).
2. Update Brunch to 1.7.
    * Added automatic source maps generation, source maps are in repo too.
3. Update Chaplin to 0.10.
    * Remove `chaplin` module, switch to global variable.
    * Switch to new declarative events format.
    * Switch to controller compositions instead of static controllers.
    * Remove `application` since Chaplin now has this functionality by default.