Qrda errata release

Addresses changes introduced by 2014 QRDA Errata Release

* Start/End time for Payer information. Includes empty effectiveTime for cat 3 supplemental data that is now required by the spec.
* Add IDs for reporting period and measure reference templates (ignored on import, they're not actually important).
* Change how measure reference IDs are represented in Cat 1 (root/extension w/OID instead of just root).