MAINT: Upgrade PyPI versions of tornado, mistune, mock, patsy

etc/requirements.txt

@@ -14,7 +14,7 @@ numpy==1.9.2
 scipy==0.15.1
 pandas==0.16.1
 # Needed for parts of pandas.stats
-patsy==0.3.0
+patsy==0.4.0
 statsmodels==0.6.1
 
 # Don't use 2.4.0.

etc/requirements_dev.txt

@@ -17,7 +17,7 @@ sphinx-rtd-theme==0.1.8
 sphinx==1.3.1
 pbr==1.3.0
 
-mock==1.1.3
+mock==1.2.0
 
 # Linting
 
@@ -33,7 +33,7 @@ pyflakes==0.8.1
 pyandoc==0.0.1
 docopt==0.6.2
 numpydoc==0.5
-mistune==0.6
+mistune==0.7
 
 # Example scripts that are run during unit tests use the following:
 
@@ -42,7 +42,7 @@ backports.ssl-match-hostname==3.4.0.2;python_version<'3.0'
 certifi==2015.4.28
 
 # tornado and pyparsing are required by matplotlib
-tornado==4.2
+tornado==4.2.1
 pyparsing==2.0.3
 
 matplotlib==1.4.3