Minor style improvements

components.jsx.js
1. Use React.addons.classSet
2. Don't call _.filter when we want all
3. Use _.countBy rahter than _.reduce

stores.js
1. Factor out duplicated code for finding item by key into method
   _itemForKey
Cleaner way to count elements, using _.filter
Bump version of react-router to 0.7.0
Merge pull request #3 from justin808/minor-style-suggestions

Minor style improvements
Updated build to work with latest bower version
Making sure empty todos are handled
Bower components are now in components folder
Updated css to new components folder
Bower now installs to bower_components again. Wtf?

Fixes #7
Fix router and blur/cancel operations
Merge pull request #8 from schotime/bug_fixes_2_and_6

Fix router and blur/cancel operations
handle ESC evt on TodoHeader
Merge pull request #9 from mikekidder/todomvc.fixes

handle ESC evt on TodoHeader
major refactor