reset() and clear() do not refresh the page config

[ed-bird]

When operating a Single Page Application (SPA), you will need to reload the configuration to faciliate switching between different types of webpage. For example:

• Go from the homepage to a basic article (no markup to markup with "productID: norcaltribune.com:basic")
• Go from a basic article to a premium article (markup with productId: "norcaltribune.com:basic" to markup with productId: "norcaltribune.com:premium"

At the moment, the existing methods reset() and clear() only clear the entitlements and open dialogs but do not reset the page config which means that the flow described above cannot currently be supported.

[ed-bird]

A workaround for this is as follows:

• Initialise swg.js manually when the application loads
• For each article page:
  • Do not re-call subscriptions.init(), this will error out saying that the library is already configured
  • Call subscriptions.getEntitlements() and check the full entitlements response to see if any of the entitlements are valid
  • Do not use entitlements.enablesThis() as it will be based on the configuration on the original page, not necessarily the configuration on the current page

It would still be good for reset() and clear() to be updated to support this flow though.