Add microdata schema to example applications
Add microdata schema to example applications

Use WebApplication schema to provide feature rich
description to Marionette example applications:
- schema based on https://schema.org/WebApplication
- all required field are provided
- the changes do not change layout at all
- the changes provides better description under readers

marionettejs/marionettejs.com,peterblazejewicz/marionettejs.com,denar90/marionettejs.com,denar90/marionettejs.com,peterblazejewicz/marionettejs.com,denar90/marionettejs.com,marionettejs/marionettejs.com,peterblazejewicz/marionettejs.com