Provide npm run target to build the webpack in development mode
Provide npm run target to build the webpack in development mode

Also, the `watch` target now always uses the development mode.

owncloud/music,paulijar/music,paulijar/music,owncloud/music,owncloud/music,owncloud/music,paulijar/music,paulijar/music,owncloud/music,paulijar/music