Requirements.txt files for testing.
This would fix the django-cms issue #1304 (https://github.com/divio/django-cms/issues/1304) that I raised today.

Background: when CMS is configured not to be at root level but at a sub site .. e.g. /content, then the multilingual url prefixes are generated correctly for HREFs, resulting in /en/content/otherpath

BUT all FORM urls end up /content/en/otherpath , and the same applies to the preview URLs in the admin….

This change fixes that, making sure all urls end up constantly as /en/content/otherpath...
Merge branch 'release/2.3rc2'
Merge remote-tracking branch 'upstream/develop' into develop
Merge commit '32239cb5ff18e9e29ed5d2a6ffb5d230c61d8db2'
Fixed #1348 corrected page_language_url on non CMS managed urls

The language chooser wasn't translating the urls on non managed CMS
views. simple_language_changer was deprecated since now that's the
default behavior.

Added the base 2.4 release notes.
Added IN DEVELOPMENT for the release notes and explained the deprecation warning for simple_language_changer
Fixed page_language_url for subpages in apphooks

There some leakage in the tests, running them in different order changes
the outcome.
Testcase for #1366. Created a testcase and a crafted plugin to demonstrate the issue
Added testcase for page objects for #1366. This issue doesn't apply to page-defined placeholders as codepath differs
Passing the context instance as object rather than dictionary
Passing the current_app parameter to the rendering methods
Setting the current_app on the context based on the page reverse_id and the app_name attribute of the CMSApp instance
Adding applications to the urlconf using application and instance namespaces
Correcting a bug in the AppRegexUrlResolver in order to support nested resolvers
[Google Maps] Code cleanup.
[Google Map] Fixes lat/longitude loading.
[Google Maps] Reverts one code styling in models.py.
Merge pull request #1388 from andrewschoen/placeholder-css-fix

fixed typo that was not allowing placeholder toolbars to show in fronten...
[Google Maps] User-settable width and height.