Fix test group
Articles can load commercial components

Included is a simple commercial component loader, packaged and managed as part of our applcation but designed provide an sensible interface for
OAS/DFP to load our own adverts (based on AMD).

```
// load the 'travel' component
require('modules/commercial/loader', function (CommercialComponent) {
    new CommercialComponent(document, { config: guardian.config }).load('travel', document.getElementById('ad-slot'));
})
```
XHR host name is now environmentally friendly
OASTOKEN replacement
Semi-colon
WIP
Jasmine tests and refactor the commercial loader
Merge branch 'master' of https://github.com/guardian/frontend into commercial-slot-loader

Conflicts:
	common/app/conf/switches.scala
Fix alpha-comm switch group
Merge pull request #2536 from guardian/commercial-slot-loader

Commercial slot loader