[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.
Merge pull request #90 from pedroigor/master

[PLINK-525] - Back-Channel Single Logout.
[PLINK-546] PicketLink AbstractIDPValve breaks clustered session replication
Fixing compilation issue.
[PLINK-546] Ignore the IllegalStateException that can occur when invoking the next valve in the pipeline
[PLINK-546] Invoke the LockingValve if its next in line
Merge pull request #91 from dehort/PLINK-546

[PLINK-546] PicketLink AbstractIDPValve breaks clustered session replication
[PLINK-552] - Post-Binding fails if user enters a wrong username in IDP login page.
Merge pull request #92 from pedroigor/master

[PLINK-552] - Post-Binding fails if user enters a wrong username in IDP login page.