Issue #276 - add surveyedLocale endpoint to rest authentication
Issue #276 - add lastUpdateTime property to surveyedLocaleRest
Issue #276 - use lastUpdateTime in surveyedLocale request

* the lastUpdateTime field is used to query only data that is newer than
that time
Issue #276 - delete unused 'checkAvailable' code
Issue #276 - use resultCount field to send number of results
Issue #276 - get exactly pageSize objects

* The objects return have indices 0 .. pageSize-1
Issue #276 - check if device is allowed to access surveyGroup

* The code checks if one of the surveys that the device
has access to is part of the right surveyGroup