Upgrade gunicorn.

Changelog: http://docs.gunicorn.org/en/stable/2016-news.html

requirements/edx/base.in

@@ -94,7 +94,7 @@ firebase-token-generator==1.3.2
 fs==2.0.18
 fs-s3fs==0.1.8
 glob2                               # Enhanced glob module, used in openedx.core.lib.rooted_paths
-gunicorn==19.0
+gunicorn==19.5.0
 help-tokens
 html5lib                            # HTML parser, used for capa problems
 ipaddress                           # Ip network support for Embargo feature

requirements/edx/base.txt

@@ -131,7 +131,7 @@ future==0.17.1            # via pyjwkest
 futures==3.2.0 ; python_version == "2.7"  # via django-pipeline, python-swiftclient, s3transfer, xblock-utils
 geoip2==2.9.0
 glob2==0.6
-gunicorn==19.0
+gunicorn==19.5.0
 help-tokens==1.0.3
 html5lib==1.0.1
 httplib2==0.12.3          # via oauth2, zendesk

requirements/edx/development.txt

@@ -165,7 +165,7 @@ future==0.17.1
 futures==3.2.0 ; python_version == "2.7"
 geoip2==2.9.0
 glob2==0.6
-gunicorn==19.0
+gunicorn==19.5.0
 help-tokens==1.0.3
 html5lib==1.0.1
 httplib2==0.12.3
@@ -320,7 +320,7 @@ text-unidecode==1.2
 tincan==0.0.5
 toml==0.10.0
 tox-battery==0.5.1
-tox==3.11.1
+tox==3.12.1
 transifex-client==0.13.6
 twisted==19.2.0
 typing==3.6.6

requirements/edx/testing.txt

@@ -160,7 +160,7 @@ future==0.17.1
 futures==3.2.0 ; python_version == "2.7"
 geoip2==2.9.0
 glob2==0.6
-gunicorn==19.0
+gunicorn==19.5.0
 help-tokens==1.0.3
 html5lib==1.0.1
 httplib2==0.12.3
@@ -307,7 +307,7 @@ text-unidecode==1.2       # via faker
 tincan==0.0.5
 toml==0.10.0              # via tox
 tox-battery==0.5.1
-tox==3.11.1
+tox==3.12.1
 transifex-client==0.13.6
 twisted==19.2.0           # via scrapy
 typing==3.6.6             # via flake8