Install pylint from a specific commit

This fixes a bug where some of our linting was crashing due to this
pylint bug: http://www.logilab.org/ticket/122793

requirements.txt

@@ -66,7 +66,6 @@ lettuce==0.2.16
 mock==0.8.0
 nosexcover==1.0.7
 pep8==1.4.5
-pylint==0.27.0
 rednose==0.3
 selenium==2.31.0
 splinter==0.5.0
@@ -74,3 +73,7 @@ django_nose==1.1
 django-jasmine==0.3.2
 django_debug_toolbar
 django-debug-toolbar-mongo
+
+# Install pylint from a specific commit on trunk
+# to get the fix for this issue: http://www.logilab.org/ticket/122793
+https://bitbucket.org/logilab/pylint/get/e828cb5.zip