better code style
Do not generated bad code when named chunks are merged or empty

fixed webpack/webpack-dev-server#30
1.3.0-beta3
fixed test case
removed incorrect code

fixes webpack/example-app#5
1.3.0-beta4
added support and a special message for browserify pre-built javascripts.

fixed #299
1.3.0-beta5
CachePlugin: Continue when file is deleted
Added experimental MultiCompiler
webpack(...) takes an array
support an array in webpack.config.js
1.3.0-beta6
fixed file system purging
added multi compiler example
1.3.0-beta7
fixed tests
[skip ci] Fix hybrid-routing example
Merge pull request #311 from mridgway/fixHybridExample

[skip ci] Fix hybrid-routing example
fixed MultiCompiler with watching
1.3.0-beta8
fixed test