Export the default object for handlebars/runtime

Maintains consistency with the prior export pattern, while avoids the knarly default loading issues.

Author: kpdecker

runtime.js

@@ -1,3 +1,3 @@
 // Create a simple path alias to allow browserify to resolve
 // the runtime on a supported path.
-module.exports = require('./dist/cjs/handlebars.runtime');
+module.exports = require('./dist/cjs/handlebars.runtime').default;