webpack fails to run

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Using node v5.4.1 and npm version 3.3.4 _on Windows 10_, see the error message:

```
rxvision>webpack
Hash: 977274e9a5b657663896
Version: webpack 1.13.2
Time: 7094ms
Asset Size Chunks Chunk Names
kefirvision.js 114 kB 0 [emitted] kefirvision
playground.js 3.88 MB 1 [emitted] playground
rxvision.js 106 kB 2 [emitted] rxvision
tests.js 844 kB 3 [emitted] tests
viz.js 175 kB 4 [emitted] viz
playground.css 10.8 kB 1 [emitted] playground
viz.css 2.02 kB 4 [emitted] viz
+ 590 hidden modules

WARNING in ./~/babel/lib/babel/util.js
Critical dependencies:
70:11-31 the request of a dependency is an expression
@ ./~/babel/lib/babel/util.js 70:11-31

WARNING in ./~/babel/lib/babel/transformation/file.js
Critical dependencies:
229:33-45 the request of a dependency is an expression
@ ./~/babel/lib/babel/transformation/file.js 229:33-45

WARNING in ./~/babel/lib/babel/transformation/file/index.js
Critical dependencies:
208:33-45 the request of a dependency is an expression
@ ./~/babel/lib/babel/transformation/file/index.js 208:33-45

ERROR in ./wrap/kefir.js
Module not found: Error: Cannot resolve 'file' or 'directory' ../tests/kefir/two-sources.json in C:\Users\numer\Documents\PROJECT\rxvision\wrap
@ ./wrap/kefir.js 110:37-79

ERROR in ./tests/kefir/index.js
Module not found: Error: Cannot resolve 'file' or 'directory' ./two-sources.json in C:\Users\numer\Documents\PROJECT\rxvision\tests\kefir
@ ./tests/kefir/index.js 14:33-62

ERROR in ./wrap/kefir.js
Module not found: Error: Cannot resolve 'file' or 'directory' ../tests/kefir/one-source.json in C:\Users\numer\Documents\PROJECT\rxvision\wrap
@ ./wrap/kefir.js 112:36-77

ERROR in ./tests/kefir/index.js
Module not found: Error: Cannot resolve 'file' or 'directory' ./one-source.json in C:\Users\numer\Documents\PROJECT\rxvision\tests\kefir
@ ./tests/kefir/index.js 12:32-60

ERROR in ./wrap/kefir.js
Module not found: Error: Cannot resolve 'file' or 'directory' ../tests/kefir/multiple-sources.json in C:\Users\numer\Documents\PROJECT\rxvision\wrap
@ ./wrap/kefir.js 114:38-85

ERROR in ./tests/kefir/index.js
Module not found: Error: Cannot resolve 'file' or 'directory' ./multiple-sources.json in C:\Users\numer\Documents\PROJECT\rxvision\tests\kefir
@ ./tests/kefir/index.js 16:34-68

ERROR in ./tests/kefir/index.js
Module not found: Error: Cannot resolve 'file' or 'directory' ./create.json in C:\Users\numer\Documents\PROJECT\rxvision\tests\kefir
@ ./tests/kefir/index.js 18:29-53
Child extract-text-webpack-plugin:
+ 5 hidden modules
Child extract-text-webpack-plugin:
+ 4 hidden modules
```


Reproduce the webpack command with the reported Node and npm versions, then inspect wrap/kefir.js and tests/kefir/index.js alongside the referenced JSON files under tests/kefir. Done means the build no longer reports the listed module-not-found errors.

Written by the indexing model from the issue text.