2.0.0-beta.2: Lime Copper

Lime Copper release contains many improvements, here is the list:

• HMR support (credit to @AngularClass)
• Postcss support (Using cssnext plugin by default)
• DotEnv support
• NGC now use official @ngtools/webpack, allows us to use loader for component css files
• Gulp is dropped now to fully utilize Webpack
• npm test now displays coverage result
• Styleguide update
• Added yarn.lock