Re #1150 Exposing timestamps to API call.
Re #1152 Implement the custom facet feature.
Merge branch 'master' of github.com:europeana/api2

Conflicts:
	api2-war/src/main/java/eu/europeana/api2/v2/web/controller/SearchController.java
	api2-war/src/test/java/eu/europeana/api2/v2/web/controller/SearchControllerTest.java