eslint: add eslint to nodereport

[gdams]

Adds eslint to be run with npm test. We should use eslintrc to remain consistent with the nodejs community such as nodejs/node and nodejs/citgm. This also allows you to use npm run lint or npm run lint --- --fix to fix linter errors.

I have also shortened the timeout to ten seconds for the tap tests

Alternative to: https://github.com/nodejs/nodereport/pull/45