CERN custom configuration

Signed-off-by: Adrian-Tudor Panescu <adrian.tudor.panescu@cern.ch>
bashrc: new Invenio exports

Signed-off-by: Adrian-Tudor Panescu <adrian.tudor.panescu@cern.ch>
bash_aliases: new Invenio structure aliases

Signed-off-by: Adrian-Tudor Panescu <adrian.tudor.panescu@cern.ch>
gitconfig: invenio-devscripts replaced by -stuff

Signed-off-by: Adrian-Tudor Panescu <adrian.tudor.panescu@cern.ch>