Switch from `<span>` to `<label>` as the todo text wrapper

TodoMVC boilerplate template

- CSS fixes
- Remove an unnecessary div wrapper

Move JS libs to libs folder and remove old jQuery version

KnockoutJS: add "Mark all as complete" checkbox and "Press Enter" tooltip.

Add the "Press Enter" tooltip that appears after a delay when the user has entered a value and stops typing

Add "Mark all as complete" checkbox bound to a writeable computed observable and minor code cleanup.

Updated jQuery example

Update ember.js app to use classNameBindings

Update Knockout.js sample to use features from 2.0.0

Add custom binding to handle the enter key, rather than checking the keycode in the view model - fixes issue #4

Resolving floating problem from issue 21.

revisions to index to cleanup some recent prs, prevent ember and sammy from initializing with a demo first task/todo

Ember.js Clear Completed Tasks Update

Resubmission of Knockback including an upgrade of Knockout to 2.0.0