Bump express-state dependency to v1.1.x
Leverage express-state's `cache` option to improve expose() performance

This updates how Express YUI exposes data to the client by using app-
scoped exposing and caching the result to increase the performance of
serialization.

A non-enumerable `__modified__` flag has been added to the YUI `config`
object which is used by the methods that modify the `config` to signal
that it seems to be re-exposed and re-serialized by express-state.
Bump express-state to ~1.1.1
Remove `__modified__` flag in favor or requiring developers to re-expose

Instead of trying to use a "magic" `__modified__` flag, it will be up
the the developer to re-expose the `YUI_config` if they make changes
to it after the first request to the app.
adjusting patches to work well when the expanded requires are available. adding polyfill supports.
getting express-yui ready to support the new changes in yui to support polyfills
no need to flag the patched status

yui core will no longer intends to use the same `Y.config.patches` data
structure to declare patches
fix server unit test for patching
Merge pull request #3 from ekashida/polyfills

fix unit test for server.js
improving the lang detection on the client side when it comes to attach the proper lang bundles modules
Merge branch 'master' of github.com:yahoo/express-yui into polyfills
Merge branch 'polyfills' of github.com:caridy/express-yui into polyfills
feature parity between server and client lang bundles resolution. this add supports for missing bundles on server and client
no more differencies between server patches and client patches. yui patches should not be bound to app instance anymore. removing server-template-get since it depends on locator bundles, and we want to walk away from it
adding tests for lang bundles patch
adding note for optional requires as it is inline to get supported at the yui level
cleaning up optionalRequires
adding tests for patches/templates-requires
history entry and bumping version for 1.1.1
updating docs for 1.1.1