Aldryn-events

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* Updated translations
* Enable configurable plugin caching for CMS 3.3.0+ installations
* Disable spelling test until sphinxcontrib-spelling is updated

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* Changed form field width in admin
* Updated tests to include Python 3.5, Django 1.9 and CMS 3.3 combinations
* Improved documentation regarding appconfig during upgrades.

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* Add support for Python 3.5

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* Add stripped default django templates to `/aldryn_events/templates`
* Remove unused render_placeholder configs
* Add static_placeholders where necessary
* Simplify templates

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* install django-tablib by default, since a Django 1.8 and 1.9 compatible
version is now available on pypi. Fixes circular import issues with previous
conditional setup of tablib on aldryn.

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* don't install django_tablib if it is not installed (aldryn)
* pretty name in admin ("Aldryn Events" instead of "Aldryn_events")