Fix: upgrade vue-eslint-parser

[mysticatea]

This upgrading will solve 2 problems.

1. Ensure making correct ASTs about self-closing elements (fixes Self closing elements break v-if rules #29). The first impression was difficult, but actually this was easy. (diff: vuejs/vue-eslint-parser@b954bee)
2. Improve the integration with eslint-plugin-import (refs Compatibility with ESLint 4 #21 (comment)). I avoid that error as I use parser.parseForESLint() alias. (diff: vuejs/vue-eslint-parser@62acbe8)

Additionally, I added some tests about above.

[michalsnik]

Good work @mysticatea. I didn't know about parseForESLint, seems like a decent solution. Btw. pretty clever way of testing this integration, not so obvious at first sight but does the job 👍