allows appData to pass in a rootPath

Backbone.history.start can take a rootPath if you're mounting the backbone app on nested url

http://backbonejs.org/#History-start
Merge pull request #193 from givingstage/mount_rendr_app_under_other_route

allow rendr to be mounted on nested url
Use rendr-handlebars@0.1.0
update versions of rendr modules in examples