Move to Handlebars.js from Mustache.js

Move templating to use Handlebars.js instead of Mustache.js, remove
Mustache.js code and references.

Signed-off-by: Jeff Godin <jgodin@tadl.org>
Merge pull request #2 from tadl/jeff_move_to_handlebars

Move to Handlebars.js from Mustache.js