With this changeset the spring servlet configuration is separeted from the
application configuration. This will result in a main context and a servlet
context, holding only spring mvc information.

This change has a very nice side effekt: Spring AOP beans will be loaded
only once in application context, not a second time in mvc servlet context.

This patch should increase findbugs report and solve some issues that
will occure:

* Doing operation on NULL object
* Using wrong object type in hope of magic object casting ;-)

Conflicts:
	src/main/java/de/thm/arsnova/controller/QuestionController.java
	src/main/java/de/thm/arsnova/dao/IDatabaseDao.java
	src/main/java/de/thm/arsnova/services/QuestionService.java

Conflicts:
	src/main/java/de/thm/arsnova/controller/QuestionController.java
	src/main/java/de/thm/arsnova/dao/IDatabaseDao.java
	src/main/java/de/thm/arsnova/services/IQuestionService.java

and the users inside of it

caused in past server errors

* rename methods to clearify that this are sockets

If a session key was used in URI path which dous not exist,
send HTTP NotFound to client instead if running into NullPointerException.

This is a quick fix for HTTP session timeout which will result in some
strange behavior in client devices.

THIS MUST BE REVOVED if client JS code is able to re-authenticate from
local storage after session timeout.

This will prevent including of selenium into final build of WAR file.

total count of food votes today
Task #4055: getFoodVote is returning a list of given votes
Task #4245: HTTP POST vote for a menu