These changes need to get deployed first in order to use them in the tests.

Eclipse plugin produces errors and we do not use self created locking.
This should be removed if eclipse plugin can handle this.

CouchDBDao:
 * Removed obsolete method currentTimestamp()
 * Explicit IOException catch that indicates communication error

UserService:
 * Log if store file could not be created

Conflicts:
	src/main/java/de/thm/arsnova/controller/QuestionController.java
	src/main/java/de/thm/arsnova/dao/CouchDBDao.java
	src/main/java/de/thm/arsnova/dao/IDatabaseDao.java
	src/main/java/de/thm/arsnova/entities/Question.java
	src/main/java/de/thm/arsnova/entities/User.java
	src/main/java/de/thm/arsnova/services/IQuestionService.java
	src/test/java/de/thm/arsnova/controller/LoginControllerTest.java

Task #4027: getQuestionById fixes if a list of answers exist which could
not morphed by self