Allow skipping of SSL verify

Thanks for making this!!

In order to use python-Wappalyzer against sites that might have invalid or self-signed SSL certs, `requests` needs the `verify=False` kwarg. This adds that functionality in an optional, backwards-compatible way.

Usage:

```
from Wappalyzer import Wappalyzer, WebPage

wappalyzer = Wappalyzer.latest()
webpage = WebPage.new_from_url('https://<my_site_with_self_signed_cert>', verify=False)
wappalyzer.analyze(webpage)
```