Do not catch authorization and conflict errors in viewlet manager.
Merge branch 'master' of git://github.com/plone/plone.app.viewletmanager
list of uncaught exceptions is extensible, unauthorized is not by default
ignore eclipse files
add keywordinterrupt to caught errors
Merge pull request #1 from tdesvenain/master

Do not catch conflict errors in viewlet manager. We can extend uncaught errors.