Issue with current CachableResource proposal

[Stefan Hepper <sthepper@hursley.ibm.com>]

While discussing in the JSR 286 EG how the producer may enforce the 
restrictions mentioned for the type FULL and PORTLET we noticed that the 
producer does not get any information back on a serve resource call 
about the cachability setting.
Therefore I propose to add the following on the ResourceParams type:
[O] string resourceCachability

providing the resourceCachability value set on the resource URL that 
triggered this getResource call. If this value is missing the default is 
that the cachability of the getResource call is of type PAGE.

Stefan