CAS-1276: Allow to configure synchronous messages sent to endpoints.
CAS-1276: Fixed incorrect prop assignment, and renamed class parameter to match prop.
CAS-1276: Fixed incorrect prop assignment, and renamed prop to match default behhavior.
CAS-1276: Added test case for sync callbacks
CAS-1276: Fixed prop description name
Merge branch 'master' into CAS-1276

Conflicts:
	cas-server-core/src/main/java/org/jasig/cas/logout/LogoutManagerImpl.java
	cas-server-webapp/src/main/webapp/WEB-INF/spring-configuration/applicationContext.xml
Merge pull request #341 from Unicon/CAS-1276

CAS-1276: Allow to configure synchronous messages sent to endpoints.