Revert "Updating version to 0.6.0-SNAPSHOT to reflect branching"

This reverts commit a36cdac05882b2b02169b2a5ba380415592e62b5.

Conflicts:
	gateway-provider-jersey/pom.xml
	gateway-provider-rewrite-step-secure-query/pom.xml
	gateway-server-launcher/pom.xml
	gateway-service-oozie/pom.xml
	gateway-shell-launcher/pom.xml
	gateway-shell/pom.xml
	gateway-test-ldap-launcher/pom.xml
	gateway-test/pom.xml
	gateway-util-launcher/pom.xml
	knox-cli-launcher/pom.xml
	pom.xml