Exclude express-middleware from browser bundle

Fix lib/loopback to include express-middleware only on the server.

Bump up strong-remoting dependency to use the version working in
browsers.
Make app.get/app.set available in browser

Implement settings object and methods in browser-express.

Add test/app.test.js to unit-tests run by karma.
Merge pull request #299 from strongloop/feature/implement-app-settings-in-browser

Feature/implement app settings in browser