Add support for Handlebars with proper AMD implementation.
Add support for Handlebars with proper AMD implementation.

This still works without AMD and for Handlebars 1.0.0 final which
has no support for AMD.

quirkey/sammy,cardil/sammy,cardil/sammy,quirkey/sammy,Moykn/sammy,Moykn/sammy,cardil/sammy,Moykn/sammy