- Handle the case where the session variable is set to NULL.  Certain
  Play Cache implementations do not like setting a field to null, so
  instead of setting the field's value remove the field.
Merge pull request #37 from nateww/master

Handle the case where the session variable is set to NULL.
prepare release
[maven-release-plugin] prepare release play-pac4j-1.3.0-RC1
[maven-release-plugin] prepare for next development iteration
update to latest versiosn
Update pom.xml
Update README.md
[maven-release-plugin] prepare release play-pac4j-1.3.0
[maven-release-plugin] prepare for next development iteration