SHIRO-285: updated SAML-based dependencies to be optional (they are not required by shiro-cas at runtime - only if the end-user configures 'saml'.  Also updated the OSGi import statement to be org.jasig.cas.client* as the main org.jasig.cas* namespace is not required.
SHIRO-285: updated SAML-based dependencies to be optional (they are not required by shiro-cas at runtime - only if the end-user configures 'saml'.  Also updated the OSGi import statement to be org.jasig.cas.client* as the main org.jasig.cas* namespace is not required.

git-svn-id: 33e7a68b83922cb39bd2fd584a64617217729dea@1228405 13f79535-47bb-0310-9956-ffa450edef68

relateiq/shiro,Collaborne/shiro