cannot load 'webpack'

[claudiopro]

> [email protected] test /Users/delphine/Development/Git/pheuter/essential-react
> PHANTOMJS_BIN=./node_modules/.bin/phantomjs ./node_modules/karma/bin/karma start karma.config.js

WARN [preprocess]: Can not load "webpack"!
  TypeError: undefined is not a function
  at Plugin.notifyKarmaAboutChanges (/Users/delphine/Development/Git/pheuter/essential-react/node_modules/karma-webpack/index.js:108:15)
  at Plugin.<anonymous> (/Users/delphine/Development/Git/pheuter/essential-react/node_modules/karma-webpack/index.js:72:9)
  at Compiler.applyPlugins (/Users/delphine/Development/Git/pheuter/essential-react/node_modules/webpack/node_modules/tapable/lib/Tapable.js:26:37)
  at Watching._done (/Users/delphine/Development/Git/pheuter/essential-react/node_modules/webpack/lib/Compiler.js:78:17)
  at Watching.<anonymous> (/Users/delphine/Development/Git/pheuter/essential-react/node_modules/webpack/lib/Compiler.js:61:18)
  at Compiler.emitRecords (/Users/delphine/Development/Git/pheuter/essential-react/node_modules/webpack/lib/Compiler.js:282:37)
  at Watching.<anonymous> (/Users/delphine/Development/Git/pheuter/essential-react/node_modules/webpack/lib/Compiler.js:58:19)
  at /Users/delphine/Development/Git/pheuter/essential-react/node_modules/webpack/lib/Compiler.js:275:11

This is the same as codymikol/karma-webpack#70

I'm preparing a PR to upgrade karma to 0.13

[pheuter]

Should be closed by #22.