Added ability to load files relative to the app root

[rosieks]

Fix #1205

[SteveSandersonMS]

Thanks for this, but could you clarify why you think we should make this change?

It looks like you're redefining ClientApp as the app root, rather than what is usually considered to be the app root, i.e., the directory containing the .csproj, Startup.cs, etc. That could also be confusing, because then there are effectively two app root directories, depending on what kind of technology you're talking about. If possible I'd prefer to keep the regular app root as being the only app root.

[rosieks]

The main change is to add any root path in webpack configuration. Right now such root is no provided so when I add in any file such code import { reducer } from 'ClientApp/store'; Visual Studio and TypeScript will be satisfied because of "rootUrl": ".", but webpack doesn't know that and it fails during execution. For that reason I have added modules section in webpack.config.js. Detailed description on that change you can find here: http://moduscreate.com/es6-es2015-import-no-relative-path-webpack/

Regarding setting app root to ClientApi I did that because de facto it is the app root from JavaScript perspective. I'm not sure if somebody reference from it to something outside. The main purpose was to have shorter path. But I can be wrong and it can be changed. By the way there is already second app root - wwwroot, so this one is third.

[SteveSandersonMS]

Thanks again for posting this.

In the next version of the ReactRedux template, the build mechanism comes entirely from create-react-app. There won't be a Webpack config file, so it would be impossible to apply this PR. As such, I'll mark this closed. Hope that's OK!