Merge pull request #220 from pedroigor/master

[PLINK-330] - DefaultPicketLinkLogger can not use parametrized methods from jboss logging.
Merge pull request #221 from pedroigor/master

[PLINK-300] - AbstractIDPValve throws NPE when using metadata and AuthnRequestsSigned is null.
Merge pull request #222 from pedroigor/master

[PLINK-209] - Debug/Error inconsistency in exception logging.
a readme
Merge pull request #223 from anilsaldhana/master

a readme
Merge pull request #224 from pedroigor/master

[PLINK-300] - Fixing test case.
Merge pull request #225 from pedroigor/master

[PLINK-331] - Support EclipseLink when running the IDM tests.