refactor(Guards): Improve guards API based on common usage

[MikeRyanDev]

Change guard factory from createGuard to provideGuard to clarify what the factory is doing. Re-order guard params to receive route params first.

BREAKING CHANGE:

Before:

  const auth = createGuard(function(http: Http) {

    return function(route: Route, params: any, isTerminal: boolean) {
      return http.get(...);
    };

  }, [ Http ]);

After:

  const auth = provideGuard(function(http: Http) {

    return function(params: any, route: Route, isTerminal: boolean) {
      return http.get(...);
    };

  }, [ Http ]);

[brandonroberts]

Docs need updating also

[brandonroberts]

Docs will be updated before next release