Update npm-shrinkwrap.json to use node-sass@3.1.1
Update npm-shrinkwrap.json to use node-sass@3.1.1

In a previous commit, I changed package.json to use version 3.1.1 of node-sass.
This commit updates our shrinkwrapped dependencies to use that version.
See https://github.com/azavea/model-my-watershed/pull/187

project-icp/bee-pollinator-app,mmcfarland/model-my-watershed,lewfish/model-my-watershed,WikiWatershed/model-my-watershed,kdeloach/model-my-watershed,lewfish/model-my-watershed,mmcfarland/model-my-watershed,kdeloach/model-my-watershed,lewfish/model-my-watershed,kdeloach/model-my-watershed,mmcfarland/model-my-watershed-1,lliss/model-my-watershed,project-icp/bee-pollinator-app,kdeloach/model-my-watershed,WikiWatershed/model-my-watershed,mmcfarland/model-my-watershed-1,lliss/model-my-watershed,mmcfarland/model-my-watershed,lliss/model-my-watershed,lewfish/model-my-watershed,project-icp/bee-pollinator-app,WikiWatershed/model-my-watershed,lliss/model-my-watershed,WikiWatershed/model-my-watershed,mmcfarland/model-my-watershed,mmcfarland/model-my-watershed-1,lewfish/model-my-watershed,lliss/model-my-watershed,kdeloach/model-my-watershed,WikiWatershed/model-my-watershed,mmcfarland/model-my-watershed,project-icp/bee-pollinator-app,mmcfarland/model-my-watershed-1