Implementing https rewrite support

I have implemented a https-rewrite support using the rewrite-rules from https-everywere. related with the issue #71.

I have tested the rules a little bit, and it look like that all is working.

I'm not sure about the licencing of the rules. I have fetched the rules from https://gitweb.torproject.org/pde/https-everywhere.git/tree/4.0:/src/chrome/content/rules, looking at https://gitweb.torproject.org/pde/https-everywhere.git/blob_plain/4.0:/src/LICENSE.txt show that all files (including the rules) are licenced under GPLv3+. I'm not sure, how to declare that correct.