Breaking Changes.md

• Remove postcss plugins (cssnext, cssimport) from default css loader config
• change webpack api
• Source & transformer plugins now use UUIDs for ids. If you used glob or regex to query nodes by id then you'll need to query something else.
• Mixed commonjs/es6 modules fail
• Remove explicit polyfill and use the new builtins: usage support in babel 7.
• Changed modifyBabelrc to onCreateBabelConfig
• Changed modifyWebpackConfig to onCreateWebpackConfig