------------------
- Fix to work with latest collective.celery
[vangheem]
- Fix issue breaking zoom on the 1st page of PDFs
[obct537]
- Add function and browser view (``convert_all_unconverted``) to convert all files, which haven't been converted yet.
[thet]
- Do not break if no global request is set. Fixes 71
[ale-rt]
- Fix redundant condition
[ale-rt]
- Handle plone.app.contenttypes file indexing.
[thet]
- Add a custom migrator for plone.app.contenttypes and avoid converting while migrating to plone.app.contettypes.
[thet]
- Added support for libreoffice under Nixos, which uses a different folder name
for its conversion directories
[pysailor]