Add ApplicationNameProcessor.
Add ServerNameProcessor.
Add Graylog2 GELF package.
Add formatter to add human-readable exception to GELF full_message.
s/setup/stepup
Enable request ID processor by default.
Enable ApplicationNameProcessor.
Enable Graylog2 logging.
Create PrimaryLogHandler.

It wraps a StreamHandler and throws a specific exception when the
stream cannot be written to.
Create and register listener that handles primary log write exceptions
Move StepupBundle into separate repository.

https://github.com/SURFnet/Stepup-bundle