Fix 'trust site' on localhost

[benstrumeyer]

• Have you followed the guidelines in CONTRIBUTING.md?
• Have you checked to ensure there aren't other open Pull Requests for the same update/change?
• Have you added an explanation of what your changes do?
• Does your submission pass tests?
• Did you lint your code prior to submission?

• When localhost is trusted, it is added to the whitelist with it's corresponding port number
• Issue #470

[christophertino]

@benstrumeyer you'll need to bump the node version in the Travis config

ghostery-extension/.travis.yml

Line 3 in 9670d45

- "lts/carbon"

Set to lts/dubnium

[christophertino]

@benstrumeyer let's use a url-parser to make this easier.

import { URL } from '@cliqz/url-parser';

Inside your if statement:
const url = new URL(pageUrl);
Then look for the host property of that url object.