is anyone working on this right now? otherwise i would start

as described in #162 with node 8 an error is thrown after starting the vuejs dev-server. This is caused by the dev-server trying to start a browser window inside the docker container which leads to a rejected promise. This PR fixes this issues. Additionally it improves the following: * remove VueResource (we use axios for http requests as i understood, therefore VueResource is not needed anymore) * fix current axios requests to also handle rejected promises correctly with catch statements * add correct node_modules path to .dockerignore

Will install sass-loader and update all components to use scss. #167 # Motivation The current vue.js setup allows only to write styles in pure css. This can be quite time consuming, error-prone and leads to redundant code. In order to use variables, mixins and all other handy tools I would suggest using a preprocessor. In vuejs this can be easily achieved by installing the preferred webpack [loader](https://vue-loader.vuejs.org/en/configurations/pre-processors.html). My suggestions would be to use SCSS because it has the same syntax as CSS and can therefore easily be adapted by people new to preprocessores. ## Expected Behavior I can write component styles with scss/sass/less/stylus and it gets compiled to css ## Current Behavior using `<style lang="scss">` leads to compile time error ## Possible Solution install missing webpack loaders

The current vue.js setup allows only to write styles in pure css. This can be quite time consuming, error-prone and leads to redundant code. In order to use variables, mixins and all other handy tools I would suggest using a preprocessor. In vuejs this can be easily achieved by installing the preferred webpack [loader](https://vue-loader.vuejs.org/en/configurations/pre-processors.html). My suggestions would be to use SCSS because it has the same syntax as CSS and can therefore easily be adapted by people new to preprocessores. ## Expected Behavior I can write component styles with scss/sass/less/stylus and it gets compiled to css ## Current Behavior using `<style lang="scss">` leads to compile time error ## Possible Solution install missing webpack loaders