Set label only if it wasn't disabled manually
fix syntax
document relation filtering

It is an awesome, hidden feature.
Merge pull request #409 from greg0ire/documentation

Documentation
Travis-CI do not use symfony dev-master (it's version 3.0 and breaks BC)
Disable deprecated errors for symfony 2.7 and higher
Merge pull request #411 from boekkooi/travis-ci

Travis-CI update/fix
Merge pull request #387 from fran6co/patch-1

Set label only if it wasn't disabled manually
Don't overwrite list templates defined in config