Upgrade all packages using pur tool

These ones were not upgraded since they are incompatible:

* docker-py
* celery
* elasticsearch
* pyelasticsearch

requirements/pip.txt

@@ -1,29 +1,29 @@
 # Base packages
 pip==9.0.1
 appdirs==1.4.3
-virtualenv==15.0.1
-docutils==0.11
-Sphinx==1.5.3
+virtualenv==15.1.0
+docutils==0.13.1
+Sphinx==1.6.2
 sphinx_rtd_theme==0.2.5b1
 Pygments==2.2.0
-mkdocs==0.14.0
+mkdocs==0.16.3
 django==1.9.12
 six==1.10.0
 future==0.16.0
 readthedocs-build==2.0.7
 
-django-tastypie==0.13.0
-django-haystack==2.6.0
+django-tastypie==0.13.3
+django-haystack==2.6.1
 celery-haystack==0.10
-django-guardian==1.4.6
-django-extensions==1.7.4
-djangorestframework==3.5.4
+django-guardian==1.4.8
+django-extensions==1.7.9
+djangorestframework==3.6.3
 django-vanilla-views==1.0.4
-jsonfield==1.0.3
+jsonfield==2.0.1
 
-requests==2.3.0
+requests==2.16.5
 slumber==0.7.1
-lxml==3.3.5
+lxml==3.7.3
 defusedxml==0.5.0
 
 # Basic tools
@@ -33,41 +33,41 @@ django-allauth==0.32.0
 dnspython==1.15.0
 
 # VCS
-httplib2==0.7.7
+httplib2==0.10.3
 
 # Search
 elasticsearch==1.5.0
 pyelasticsearch==0.7.1
-pyquery==1.2.2
+pyquery==1.2.17
 
 # Utils
 django-gravatar2==1.4.0
 pytz==2013b
-beautifulsoup4==4.1.3
+beautifulsoup4==4.6.0
 Unipath==1.1
 django-kombu==0.9.4
 mimeparse==0.1.3
-mock==1.0.1
-stripe==1.20.2
-django-formtools==1.0
-django-dynamic-fixture==1.8.5
+mock==2.0.0
+stripe==1.56.0
+django-formtools==2.0
+django-dynamic-fixture==1.9.5
 docker-py==1.3.1
 django-textclassifier==1.0
-django-annoying==0.10.1
+django-annoying==0.10.3
 django-messages-extends==0.5
 djangorestframework-jsonp==1.0.2
 
 # Docs
-sphinxcontrib-httpdomain==1.4.0
-commonmark==0.5.5
+sphinxcontrib-httpdomain==1.5.0
+commonmark==0.7.3
 recommonmark==0.4.0
 
 # Version comparison stuff
 packaging==16.8
 
 # Commenting stuff
 django-cors-middleware==1.3.1
-nilsimsa==0.3.7
+nilsimsa==0.3.8
 
 # Pegged git requirements
 git+https://github.com/zyga/django-pagination.git@86caf15#egg=django_pagination-dev