Update the Python version

Other small changes:
* output the list of installed python packages
* tee the pylint output to the console so the build doesn't timeout when computing violations

circle.yml

 machine:
   python:
-    version: 2.7.3
+    version: 2.7.10
 
 general:
   artifacts:
@@ -20,7 +20,7 @@ dependencies:
     # cache the virtualenv at that state, so that
     # the next build will not need to install them
     # from scratch again.
-    - pip install --exists-action w -r requirements/edx/pre.txt 
+    - pip install --exists-action w -r requirements/edx/pre.txt
     - pip install --exists-action w -r requirements/edx/github.txt
     - pip install --exists-action w -r requirements/edx/local.txt
 
@@ -34,6 +34,10 @@ dependencies:
 
     - pip install coveralls==1.0
 
+    # Output the installed python packages to the console to help
+    # with troubleshooting any issues with python requirements.
+    - pip freeze
+
 test:
   override:
     # Run tests for the system.

scripts/circle-ci-tests.sh

@@ -55,7 +55,9 @@ else
             paver run_pep8 > pep8.log || { cat pep8.log; EXIT=1; }
 
             echo "Finding pylint violations and storing in report..."
-            paver run_pylint -l $PYLINT_THRESHOLD > pylint.log || { cat pylint.log; EXIT=1; }
+            # HACK: we need to print something to the console, otherwise circleci
+            # fails and aborts the job because nothing is displayed for > 10 minutes.
+            paver run_pylint -l $PYLINT_THRESHOLD | tee pylint.log || EXIT=1
 
             mkdir -p reports
             echo "Finding jshint violations and storing report..."