Friends dont let friends use bat

- Jenkins runs `call npm run ci`
- gulp takes over
 - clean, build, test, dist
- Jenkins interprets test results

Jenkins currently pointing at this branch. Success output [shown here](https://dev.datasplice.com/jenkins/job/dev_datasplice-plugin-esri-datasource/12/console).

The build artifact is now at `dist/Server/EsriDataSourcePlugin.dll` in preparation for merging with https://github.com/DataSplice/datasplice-plugin-leaflet/pull/35