Small improvements and some restructuring

This release contains a restructured directory with better specification of the build directory, an initial documentation in vuepress, an example for a todo mvc and the slides of a recent talk regarding vue-i18n and vuex-i18n at a vue-meetup in Switzerland.

Improvements:

• Regexp for variable identifiers should now be more robust. See #98
• Warnings can now be suppressed via config. See #99