Support single-file Vue components in Web IDE
It looks like [single-file Vue components](https://vuejs.org/v2/guide/single-file-components.html) are not supported by the Web IDE: ![Screen_Shot_2018-06-17_at_21.48.30](/uploads/cdeac003c0260b9bb212ede99a848a98/Screen_Shot_2018-06-17_at_21.48.30.png) This is same file in the file viewer: ![Screen_Shot_2018-06-17_at_21.48.55](/uploads/1b4145de2d6d27d70d65cdb953fcbc68/Screen_Shot_2018-06-17_at_21.48.55.png) In order to use the Web IDE for frontend development of GitLab itself, support for single-file Vue components is essential.
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