live demo

this branch creates this page: https://www.optimizely.com/resources/live-demo-webinar

functionality on the local page should be identical to the url above.

some things to check:

1. go through the whole signup flow on safari, firefox, chrome, android and find bugs

some notes:
1. i created a way to compile client side handlebars templates which is documented in [the wiki](https://github.com/optimizely/marketing-website/wiki/Client-side-handlebars-templates)
2. i refactored a lot of the modal window css and turned off the history api stuff which we can figure out after launch 

resolves https://github.com/optimizely/marketing-website/issues/17