[BZ1069126] Enhancements to STSClientPool and STSClientFactory and small
issue fixes.  

Conflicts:
	picketlink-jbas-common/src/main/java/org/picketlink/identity/federation/bindings/jboss/auth/SAML2STSCommonLoginModule.java
	picketlink-jbas-common/src/main/java/org/picketlink/trust/jbossws/jaas/JBWSTokenIssuingLoginModule.java
Merge pull request #83 from pskopek/PLINK-316-sts-client-pool

[BZ1069126] Enhancements to STSClientPool and STSClientFactory and small
[PLINK-525] - Back-Channel Single Logout.