add failing test to confirm that the ModificationDate is changed on migration when content of folders is migrated (also when the folders containing the content is migrated)
add convenience-method to add the browser-layer to the request
Fix #62: Keep ModificationDate during migration.
Merge pull request #114 from plone/#62_modification_date_changed

fix #62 modification date changed
Modernize robot tests
Merge pull request #118 from plone/jaroel-fix-robot-tests

Modernize robot tests
fix regression coming from plone.dexterity now having notifyModified
Merge branch 'master' into #102_warning_for_uneditable_content