removed reference to https://www.pivotaltracker.com/projects/280483#!/stories/40857085
removed reference to pivotaltracker
removed unused import
Merge pull request #142 from sashakruglov/pivotaltracker_40857159

removed reference to pivotaltracker
Merge pull request #141 from sashakruglov/pivotaltracker_40857085

removed reference to https://www.pivotaltracker.com/projects/280483#!/stories/40857085
Merge pull request #143 from sashakruglov/pylint_fixes

removed unused import