Dart v1 pr

A refresh for the release of Dart 1.0 !
* selector api breaking changes
* files are moved to a vanilla directory, as it's not a MVC implementation (as vanillajs) (as discussed here https://github.com/tastejs/todomvc/pull/711 )
* use of a dedicated dependency for UUID
* HTML escape is done by std lib
* compiled file update
* .maps file (for sourcemap) is commited
* directories layer simplified (/web directory is not mandatory)
* readme update

As a result of libs use, the final compiled file is now 200k instead of 130. Pruning is not completely ok yet i guess =]. Using librairies still seems to be the good practice to me...