Add doctrine/annotations:v2, doctrine/event-manager:v2 and doctrine/persistence:v3 support

[Slamdunk]

I've seen that #82 and #83 have been marked as BC BREAK This PR contains a BC break; major version should be incremented but it seems to me that this can be released in a new MINOR, so we can ease the upgrade path for users.

After that, doctrine/cache:v2 needs the work of @mrVrAlex in #72 and a new MAJOR

[mrVrAlex]

Good point.
But anyway I still have a general questions:
If we now have support ORM only from 2.14 version, where have both support for cache 1.13 || 2.0 like and both persistanse major versions, also ORM not required annotations package anymore (optional), then why these packages are locked here?)

[Slamdunk]

then why these packages are locked here?

Because we can only clean them up in a new MAJOR, while this PR is only intended for a new MINOR.

In your PR I would definitively throw out of the window any non-latest release 👍

[Ocramius]

@Slamdunk if this doesn't change any inherited symbols, I'd be inclined to doing it in a minor release: WDYT?

[Slamdunk]

Yes please.

[Ocramius]

Thanks @Slamdunk!