when using npm linked repos, source-map-loader must be present in all of them

[seansfkelley]

Discovered this along with #13, so you can see a repro at the same repo: https://github.com/seansfkelley/source-map-loader-bug under "bonus bug".

Summary: if you want to do local development across multiple repos and so have npm linked them together, source-map-loader must be installed in each linked repo, which is unexpected. It should only be necessary in the root repo, which is the one actually running webpack.

[seansfkelley]

Turns out this is a bug with webpack itself. Closing in favor of webpack/webpack#2442.