Required changes to support Search App

CHANGELOG
- added ac.url.find() API to support mojito-* related dependencies
- added ac.url.linkTo() helper to support url generation based on route name
- lib/mojito.js now integrates with expressjs via "Branding"
- lib/middleware : app specific middleware are now passed a `midConfig` object during registration
- lib/router : uses `getStaticAppConfig().routesFiles` as the source to load routes configuration

TODO
- [x] fix unit tests
- [x] fix functional tests
- [x] update examples
- [ ] update `next` docs