on version change nav to index page.
on version change nav to index page.

Since the name of classes change, it is silly to assume they exist in
prev versions.

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