Update CHANGES.rst

Add changelog for searchable text indexer (wasn't included in branch)
Update Dutch translations
Use link title to show more information in content search

When dealing with thousands of content items, it's not unusual to have several items from different places sharing the same title. Showing the path and content type in the link title is a simple way to provide more information to cover composers.
Merge pull request #409 from cguardia/master

Use link title to show more information in content search
Update bootstrap.py to use zc.buildout from 2.x branch
Update CI configuration to include tests under Plone 5.0
Fix syntax errors on .travis.yml
Fix Travis CI configuration

- Remove phantom build included in previous commit
- Finish quickly in case of errors
content chooser tests did not take new title attribute into account
Merge branch 'master' of github.com:collective/collective.cover
Remove link integrity tests as they are Products.PloneTestCase-based and I have no intention of maintain them (refs. #410)
Make a saner control of version pinning
Merge branch 'master' into issue_407