v0.6.30

• Save on localstore all data. When you request a resource or collection, first check memory. If its empty, read from store. If is empty, get the data from back-end.
• HttpStorage deprecated: jsons were saved as sent by the server, now we save json with logic (saving ids and resources separately).
• Service with toServer() and fromServer() functions. They execute before and after http request. Ideal for type conversions.
• JsonapiCore.duplicateResource(resouce, ...relationtypes) return a duplication of resource. You can duplicate resources and, optionally, their relationships. (v0.6.16)
• resource save() method return a promise.
• Fix problem with Possibly unhandled rejection: undefined with new AngularJs.