[BlackBerry10] Removed builder from platform.js

- builder is deprecated, switching to moduleMapper
- removed dependency on blackberry10/plugin/blackberry10/platform.js

Reviewed by Bryan Higgins <bhiggins@blackberry.com>
Tested by Tracy Li <tli@blackberry.com>
[BlackBerry10] Fix notification handling of commas in button labels

Reviewed by Bryan Higgins <bhiggins@blackberry.com>
Tested by Tracy Li <tli@blackberry.com>