Merge pull request #710 from edx/db/update-lxml

Update lxml to 3.4.4

requirements/base.txt

@@ -27,5 +27,5 @@ South==1.0.1
 voluptuous==0.8.5
 
 # AI grading
-git+https://github.com/edx/ease.git@release-2015-07-09#egg=ease==0.1.3
+git+https://github.com/edx/ease.git@release-2015-07-14#egg=ease==0.1.3
 git+https://github.com/edx/nltk.git@2.0.6#egg=nltk==2.0.6

requirements/wheels.txt

@@ -2,7 +2,7 @@
 # To speed up the test builds, we create binary "wheel" archives.
 # http://pip.readthedocs.org/en/latest/reference/pip_wheel.html
 
-lxml==3.3.6
+lxml==3.4.4
 numpy==1.6.2
 scikit-learn==0.12.1
 scipy==0.14.0