Main checking of URL against blacklist logic
Main checking of URL against blacklist logic

- for a given URL the fn will load the blacklist from local storage and check if any matches are found
- the main matching logic is done in the `doesExpressionMatchURL` fn, which is applied to each blacklist item in `blacklistMatchesExist`
- now the main logic consists of a `String.prototype.includes()` call; obviously this is very naiive, so next step is to improve this

WorldBrain/WebMemex,WorldBrain/WebMemex