Added query-method for RelationDictDataManager.
Added RelationListDictDataManager.
Merge pull request #4 from fourdigits/datagridfield-integration

Datagridfield integration
Merge branch 'master' into datagridfield-integration

* master:
  Back to development: 1.2.3
  Preparing release 1.2.2
  Update changelog.
  plone.rfc822 1.0.2 marshalls collections as ascii.
  Remove the adaptation from this package and move it to plone.app.widgets
  Do not include demo by default
  Remove plone.formwidget.contenttree dependency
  Use the widget provided by plone.app.widgets
  Unpin 'plone.app.relationfield' so this development version is used
  Overrule Plone's versioning.
  Add bootstrap/buildout.cfg to run tests locally
  Add travis configs
Merge branch 'master' into datagridfield-integration

* master:
  Unpin plone.app.relationfield, so buildout uses this checkout
Add history
Rearrange tests for plone.app.testing
fix extras_require
Add tests for RelationListDictDataManager
Merge pull request #6 from plone/datagridfield-integration

RelationDictDataManager and RelationListDictDataManager