update UPGRADE.md
remove Doctrine Dbal and Orm from core package

Both extension have moved to there own repository
refactor: remove hard-coding to Metadata library

- SearchFactory still accepts the old MetadataFactoryInterface
  but uses a BC layer which will be removed in the next major version

- `Rollerworks\Component\Search\Metadata\Field` deprecated in favor
   of `Rollerworks\Component\Search\Mapping\Field`

- FieldSetBuilder only only accepts the new MetadataReaderInterface
  This class should not be used as stand-alone so this is no problem.

- Move JMS Metadata library related classes to there own package:
  "rollerworks/search-jms-metadata"
feat(Metadata): add NullMetadataReader
refactor: move Symfony DI to its own package
update README.md

[skip ci]
Merge pull request #22 from rollerworks/package-split

feature #22 Split none-core extensions to there own repository (sstok)

This PR was merged into rollerworks:master branch.

Discussion
----------

|Q            |A  |
|---          |---|
|Bug Fix?     |no |
|New Feature? |no |
|BC Breaks?   |not at the moment|
|Deprecations?|no |
|Tests Pass?  |yes|
|Fixed Tickets|#12|
|License      |MIT|

Todo:

- [x] Doctrine DBAL
- [x] Doctrine ORM
- [x] JMS Metadata
- [x] Symfony DI extension
- [x] ~~Symfony Validator extension~~ (keep this in the core)
     
Sent using [Gush](https://github.com/gushphp/gush)

Commits
-------

0e4d329ec6934f9ca6ac2efdccc7287d423bcff2 update UPGRADE.md (sstok)
81083486a36f077414d0b51d6f72807097c5b295 remove Doctrine Dbal and Orm from core package

Both extension have moved to there own repository (sstok)
66a9fe688bb011c364bde7b6cd389bea97bf7795 refactor: remove hard-coding to Metadata library

- SearchFactory still accepts the old MetadataFactoryInterface
  but uses a BC layer which will be removed in the next major version

- `Rollerworks\Component\Search\Metadata\Field` deprecated in favor
   of `Rollerworks\Component\Search\Mapping\Field`

- FieldSetBuilder only only accepts the new MetadataReaderInterface
  This class should not be used as stand-alone so this is no problem.

- Move JMS Metadata library related classes to there own package:
  "rollerworks/search-jms-metadata" (sstok)
ea41e42e9e454a4c10313f73386430e2c6cbf50e feat(Metadata): add NullMetadataReader (sstok)
cb1f7611a3f1d92af92971c31825882ee9356d78 refactor: move Symfony DI to its own package (sstok)
f6476bcea20af53999846062abf9c6a57a9eb136 update README.md

[skip ci] (sstok)