Progress implementing caching; language caching temporarily disabled due to bug in Zend translator component.

Fixed problem with getResourcesForTag() returning values that were incompatible with the corresponding RowGateway class.

Changed return format of record driver getURLs method to fix two problems: now we can specify routes in the return value, and we can provide the same link multiple times with different descriptions when needed.  Added record helper methods to process and normalize the various getURLs() return value possibilities.