SEC-2292: Add test to assert CSRF bypass of methods is case sensitive

HTTP methods should be case sensitive, so add test to ensure that this is
the case http://www.w3.org/Protocols/rfc2616/rfc2616-sec5.html#sec5.1.1
SEC-2294: Update Spring Version to 3.2.4.RELEASE
SEC-2300: Update Spring LDAP version to 1.3.2.RELEASE