Change version of pom.xml to 2.6.4-SNAPSHOT
Merge branch 'branches/rudder/2.6' into branches/rudder/2.7

Conflicts:
	authorization-api/pom.xml
	eventlog-api/pom.xml
	historization-api/pom.xml
	pom.xml
	spring-run-dependencies/pom.xml
	utils/pom.xml
Merge branch 'branches/rudder/2.7'