Update sass dependency to version 3.1.17
Update sass dependency to version 3.1.17

jamiekelly/adopt-a-hydrant,jasnow/adopt-a-hydrant,Bryanprz/adopt-a-street,Stackato-Apps/adopt-a-hydrant,openshift-quickstart/adopt-a-hydrant-openshift-quickstart,jamiekelly/adopt-a-hydrant,baraka101/dar-adopt-a-mtaro,voyera/adopt-a-hydrant,OpenTwinCities/adopt-a-tree,OpenTwinCities/adopt-a-tree,HackMichiana/adopt-a-bus-stop,t-pfaff/adopt-a-hydrant,codeforboston/adopt-a-hydrant,codefornigeria/adopt-a-hydrant,billyfung/van-racks,Stackato-Apps/adopt-a-hydrant,friendlycode/adopt-a-hydrant,akintoey/adopt-a-hydrant,baraka101/dar-adopt-a-mtaro,codeforsavannah/adopt-a-garden,codeforanchorage/adopt-a-hydrant,baraka101/dar-adopt-a-mtaro,billyfung/van-racks,0111001101111010/adopt-a-spot-odu,CostantinB/adopt-a-hydrant,OpenTwinCities/adopt-a-tree,CostantinB/adopt-a-hydrant,codefornigeria/adopt-a-hydrant,0111001101111010/adopt-a-spot-odu,akintoey/adopt-a-hydrant,codeforamerica/adopt-a-hydrant,code4sac/adopt-a-light,t-pfaff/adopt-a-hydrant,codeforamerica/adopt-a-hydrant,t-pfaff/adopt-a-hydrant,openshift-quickstart/adopt-a-hydrant-openshift-quickstart,codefornigeria/adopt-a-hydrant,codeforsavannah/adopt-a-garden,code4sac/adopt-a-light,openshift-quickstart/adopt-a-hydrant-openshift-quickstart,codeforanchorage/adopt-a-hydrant,billyfung/van-racks,Bryanprz/adopt-a-street,CostantinB/adopt-a-hydrant,akintoey/adopt-a-hydrant,jasnow/adopt-a-hydrant,Stackato-Apps/adopt-a-hydrant,eebbesen/adopt-a-tree,eebbesen/adopt-a-tree,voyera/adopt-a-hydrant,friendlycode/adopt-a-hydrant,codeforboston/adopt-a-hydrant,HackMichiana/adopt-a-bus-stop,codeforamerica/adopt-a-hydrant,OpenTwinCities/adopt-a-tree,jamiekelly/adopt-a-hydrant,Bryanprz/adopt-a-street,eebbesen/adopt-a-tree,friendlycode/adopt-a-hydrant,jasnow/adopt-a-hydrant,voyera/adopt-a-hydrant