- Corrected several syntaxical inconsistencies (quoting, single-statement
  blocks, indentation, opt = opt || default idiom), no semantic impact
- Added .editorconfig
- Default value for stats in the 'done' callback (when webpack crashes
  before generating stats, eg. file error)
- More idiomatic PluginError (Error object err is passed instead of err.message)
Merge pull request #24 from elierotenberg/master

Miscellanous corrections with very minor impact