Removed duplicate slf4j dep. from jboss6 profile
Set source and target version to 1.6 for the generated project.

Although this was working fine on the command line maven builds, m2e in
Juno defaults the project's source version to 1.5, which causes compile
errors on @Override annotations in the generated project.
Fixed up test case so it only does the IoC bootstrap once (in AbstractErraiJaxrsTest)