opensaml 2.5.2, log4shib 1.0.6, xml-security-c 1.7.0, xml-tooling-c 1.5.2

Adding opensaml and dependencies

- opensaml 2.5.2 requires boost < 1.53.0 (http://shibboleth.net/pipermail/users/2013-February/008302.html)