[WIP] Improvements / Refactoring

[prolic]

This is my first PR to get in touch with doctrine orientdb odm:

• add EventManager [WIP: make use of it]
• refactor getRepository method to check for repository class in class meta data [WIP: missing tests]

[odino]

totally pro this PR! 👍

What about adding / fixing the tests?

[prolic]

I am still working on this one. See the title WIP (Work in Progress).

[odino]

sweet!

[odino]

@nrk this PR looks awesome to me. What do you say, merge it?

@prolic thanks for the effort! :)

[prolic]

Sorry for being so late. My initial goal to complete this is way beyond.
Actually, it should be ready to merge, however I would like to make further additions, but that could also be handled in another PR.

[odino]

@prolic yup, you can go with another PR. Im waiting @nrk's feedback to merge it

[nrk]

@odino sorry I won't be able to review @prolic's PR right now until the end of the month, but as far as I remember the last time I checked it seemed OK to me (admittedly I couldn't find the time to test or have a deeper look into the code).