Add baseline check to Tycho build

[vogella]

Maven Tycho supports since a while to run a API baseline check. We should enable this so that we do not break GEF consumers unintentional.

[azoitl]

I would like to take over this task. However I must confess I would first need to read a bit on that. Do you have a pointer for me where to start?

[azoitl]

Nevermind, after some more googeling and reading I think I know what needs to be done. Working on a first pull request.

[vogella]

Can you send a PR? Would be nice to have this in ASAP

[vogella]

Done via 8769f0a Thanks @azoitl

[azoitl]

I have the patch ready [1]. But messed up my GIT. Therefore I would need the pull request for issue #8 merged first if that is not to big of a problem.

[1] https://github.com/azoitl/gef-classic/tree/BaselineCheck

[azoitl]

Ok now I'm confused. How did you get my patch? Still struggling with this strange github workflow.

[vogella]

You seem to have added it to #23