Implement dynamic locale lookup.

Allow dynamic locale lookup and rerendering when the `application.locale` value changes.

* Requires 1.9.0-beta.3.
* Removes `t` utility function (it was not usable standalone).

Closes #1.

@bcardarella - This is a fairly significant refactor. Please feel free to close this PR and reimplement using this as inspiration on how to get the rerendering to work.
Confirm, I was thinking about this last night. I *think* this can be accomplished via initializers. If the `util` exports a singleton that is injected into all aspects of the framework that should also instantiate it with the container.