Plone-app-async

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- Add zope.minmax dependency
[vangheem]

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- fix tests, and helpers mainly for plone.app.async testing layer consumers (collective.cron) [kiorky]
- fix rst markup [kiorky]

----------------

- buildout infrastructure refresh [kiorky]
- plone 4.3 compatibility [kiorky]
- Switch tests from collective.testcaselayer to plone.app.testing [kiorky]
- Merge expemimental work on UI & jobs back to master
[kiorky]
- Add plone UI to view jobs
[davisagli]
- Added support for queued/deferred tasks.
[kiork,davisagli,do3cc]

----------------

- Fix includes to work correctly with dexterity and
to include simplejson.
[vangheem]

- Change ping intervals to something more sane so it doesn't
take so long for your workers to come back online after restart.
[vangheem]

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- Add MANIFEST.in.
[WouterVH]

- Change zcml:condition for zope.(app.)keyreference to use the plone-4
feature.
[vangheem]

- Always use loadZCMLFile in testcase layers to not break under Zope 2.13.
[stefan]

- Avoid excessive ZODB growth by increasing the dispatcher ping intervals.
https://mail.zope.org/pipermail/zope-dev/2011-June/043146.html
[stefan]

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- Conditionally include zope.app.keyreference ZCML.
[vangheem]

- Fix for async jobs started by anonymous user.
[naro]

- Add full set of example buildouts.
[stefan]

- Make tests pass under Plone 3 and 4. Exception representations have changed
for some odd reason.
[stefan]