[weex] Expose version and config on subVue

[Hanks10100]

In Weex, the Vue variable in each js bundle is generate by Vue.extend({}) actually, and pass some global properties to it. But forget to expose the version and config on subVue.

I additionally exposed three props to subVue:

• version
• weexVersion
• config

Some libs, such as Vuex, may relay on the version and config.