Merge pull request #4026 from edx/db/requests-2

Upgrade `requests` module

docs/shared/requirements.txt

@@ -37,7 +37,7 @@ Markdown==2.2.1
 mock==1.0.1
 networkx==1.7
 nltk==2.0.4
-oauthlib==0.5.1
+oauthlib==0.6.3
 paramiko==1.9.0
 path.py==3.0.1
 Pillow==1.7.8
@@ -50,7 +50,7 @@ python-memcached==1.48
 python-openid==2.2.5
 pytz==2012h
 PyYAML==3.10
-requests==1.2.3
+requests==2.3.0
 Shapely==1.2.16
 sorl-thumbnail==11.12
 South==0.7.6