Update requirements.txt

Especially this is importand for haystack, because the old version had some DepricationWarnings.

This means, that django-haystack 2.1 and django 1.8 will not be compatible

See #1352

requirements.txt

@@ -3,7 +3,7 @@
 
 # Requirements for development and tests in alphabetical order
 coverage==3.7.1
-flake8==2.1.0
+flake8==2.2.4
 
 # Requirements for OpenSlides handbook/documentation in alphabetical order
 Sphinx==1.2.2

requirements_production.txt

@@ -2,14 +2,14 @@
 Django>=1.7,<1.8
 beautifulsoup4>=4.1,<4.4
 bleach>=1.4,<1.5
-django-ckeditor-updated>=4.2.3,<4.3
-django-haystack>=2.1,<2.2
+django-ckeditor-updated>=4.2.3,<4.4
+django-haystack>=2.1,<2.4
 django-mptt>=0.6,<0.7
-jsonfield>=0.9.19,<0.10
-natsort>=3.2,<3.5
+jsonfield>=0.9.19,<1.1
+natsort>=3.2,<3.6
 reportlab>=3.0,<3.2
 roman>=2.0,<2.1
-setuptools>=2.1,<5.8
+setuptools>=2.1,<7.1
 sockjs-tornado>=1.0,<1.1
 tornado>=2.1,<4.1
 whoosh>=2.5.6,<2.6