CAS-1442: Add support for CHANGE_AFTER_RESET flag

Also alow for a method of extending the error map.
CAS-1442: switched to protected static
Merge branch 'master' into CAS-1442

Conflicts:
	cas-server-support-ldap/src/main/java/org/jasig/cas/authentication/support/DefaultAccountStateHandler.java
Merge pull request #422 from Unicon/CAS-1442

CAS-1442: Add support for CHANGE_AFTER_RESET flag