Improve the Weextoolkit's experience and add new features

The new version of the weex-toolkit will support some of the following features:

• weex-lint plugin

• weex-devtool 2.0

The `weex-lint` is a plugin for weex detects whether the syntax is normative and whether there is a runtime error.and a common fix.

The `weex-devtool 2.0` is an upgrade version of `weex-devtool`, the upgrade version will rewrite the message storeroom of `weex-devtool`, unify the logger and inspector log information, provide a more beautiful interface and lower operating costs, and also The performance data provided by the weex module provides the developer with a page optimization basis.