Merge pull request #15 from MITx/vik/deployment_work

Versions for reqs

pre-requirements.txt

-numpy
+numpy==1.6.2

requirements.txt

-boto
-coverage
-dogstatsd-python
-lxml
-mock
-nltk
-nose
-scipy
-path.py
+boto==2.6.0
+coverage==3.5.3
+dogstatsd-python==0.2
+lxml==3.0.1
+mock==0.8.0
+nltk==2.0.3
+nose==1.2.1
+scipy==0.11.0
+path.py==3.0
 pip
-pylint
-pytz
+pylint==0.26.0
+pytz==2012h
 scikit-learn==0.12.1