Fix proposal for issue #565

Normalizes the user input so that we consider the uid is always
lowercased.

Note: subject to change in a near future to allow using an other LDAP
field in distinguished name, see issue #567.

Conflicts:
	analytics/src/main/webapp/site/js/lib/external/ext
proxy: only ROLE_MOD_LDAPADMIN can access /ldapadmin/privateui - see #571
Merge branch '13.09'