Ship minified OEX shim libraries + OEX shim updates

Ship minified OEX shim libraries (+ update to the latest oex_shim libraries from https://github.com/operasoftware/operaextensions.js/tree/master/build)

OEX shim updates (by commits on the main repo) include:

* Pull request 1: [General bug-fixing WP1](https://github.com/operasoftware/operaextensions.js/pull/1)
  * [Clean-up Widget API loading](https://github.com/richtr/operaextensions.js/commit/059722f5da09d75bd0724277fc871afc52b7e340)
  * [Clean-up Content Menu API code base](https://github.com/richtr/operaextensions.js/commit/cf5953e09a5670cb0d2b99f4906176fa9df7b543)
  * [Re-order opr.speeddial check to avoid (non-fatal) console error display](https://github.com/richtr/operaextensions.js/commit/a77ea066937d17c8804acfbd16b29abfdaebb450)
* Pull request 2: [Fix premature firing of DOMContentLoaded in Ready.js](https://github.com/operasoftware/operaextensions.js/pull/2)
  * [Fix premature firing of DOMContentLoaded in Ready.js](https://github.com/richtr/operaextensions.js/commit/c82bc6955b72ec94cb088625d1603d36aee0bcc0)