v2.2.0-rc.0

This is the first RC for webpack 2. We will try to avoid breaking changes now until webpack 3.

Bugfixes:

• id in generated code of a context module is correctly escaped
• context modules are now affected by NamedModulesPlugin, HashedModuleIdsPlugin, DllPlugin
• performance hints ignore SourceMaps now
• don't include multiple use stricts
• imports also mark the module as ES2015 module like exports
• exit the process correctly when watching and a critical error happens
• externals are no longer moved by the commons chunk plugin

Features:

• entrypoints are flagged with [big] if they are over the limit
• improve validation errors
• allow to alias loaders to a value with query
• performance improvements