Passing additional args breaks scripts

[ericclemmons]

package.json:

{
  "test": "per-env",
  "test:development": "mocha --watch",
  "test:test": "mocha"
}

Breaks:

$ npm test -- --grep api

> @terse/webpack@0.0.5 test /Users/Eric/Projects/ericclemmons/terse-webpack
> per-env "--grep" "api"


> @terse/webpack@0.0.5 test:development /Users/Eric/Projects/ericclemmons/terse-webpack
> mocha --watch "api"

/Users/Eric/Projects/ericclemmons/terse-webpack/node_modules/mocha/lib/utils.js:634
        throw new Error("cannot resolve path (or pattern) '" + path + "'");
        ^

Error: cannot resolve path (or pattern) 'api'

Works:

$ npm run test:development -- --grep api