Plone.app.caching

Bug fixes:

- Only fire 1 Purge() when deleting content, instead of 3 [skurfer]
Detect and ignore content creation more reliably [skurfer]
Also purge the parent object when something changes (since the parent probably displays a list that includes the item being changed)
[skurfer] (37)

Breaking changes:

- Removed legacy resource registries [ksuess] (45)

Bug fixes:

- Warn after save if caching was disabled while purging is still enabled.
[jensens]

Clean-up

- Legacy code clean-up
Handling of legacy resource registries Products.ResourceRegistries removed
[ksuess]

New features:

- Python 3 support
[pbauer, MatthewWilkes, ale-rt]

New features:

- Use plone as i18n domain in ZCML files too
[erral]

- Use plone as i18n domain
[erral]

Bug fixes:

- Fix backslash escapes in i18nstring (poedit complains).
[jensens]

New features:

- Prepare for Python 2 / 3 compatibility
[b4oshany, davilima6]