babel-eslint support

[mysticatea]

Currently, vue-eslint-parser is using the default parser (espree).
It needs the capability to use custom parsers to parse <script> element.

For example:

{
    "parser": "vue-eslint-parser",
    "parserOptions": {
        "vue-eslint-parser": {
            "parser": "babel-eslint"
        },
        "sourceType": "module",
        "ecmaVersion": 2017
    }
}

[mysticatea]

Known limitations: it cannot support relative paths for the parser option. vue-eslint-parser cannot know the location of the .eslintrc.* file which has the option.

[mysticatea]

Closed by b16a6c1