Update Dependencies, including Elm 0.17

• Elm upgraded to version 0.17. See Elm 0.17 upgrade docs for more details.
• ncu executed on npm version to ensure that the npm packages are kept up to date.
• The elm-test npm script and module are gone because the module has not been updated for Elm 0.17. It is also no longer needed because elm-test Elm module now reports the correct error code to the shell.