Polymer: Updated to use core-*

Browser tests no longer mandate hidden items are removed from the DOM

Fixes #908 - tests no longer mandate hidden items are removed from the DOM
Closes #790 - these were implementations that implemented routing via hiding items, rather than removing from the DOM

Regressions:
#949 - discovered that exoskeleton is badly broken
#858 - added typescript-backbone (might not be a regression, more likely missed earlier)

Updated knownIssues based on recent updates to puremvc, react, soma etc ...

Some slightly stylistic changes more recent versions of Ember let's us do.

A combination of children route getting their parent model by default and being able to supply a route's template name let's us use {{outlet}} instead of mutating the state on a shared controller object.

Automatic component lookup let's us remove the explicit registration of the todo input. We can also re-use the component for both new todos and editing todos.

Closes #943

Ember: Upgrade to 1.6.0

fixes #941

improve collection flow in backbone examples

reduce redundant filter & without syntax

reduce redundant filter & without syntax

Cache $todoList and improve readability

reduce redundant filter & without syntax

backbone-marionette-require: cancel editing on escape keypress

Dart sample fixed

ariatemplates - cancel editing on escape keypress

Backbone-require - cancel editing on escape keypress

Knockback - cancel editing on escape keypress