Add ssl_options to make_request, so that client TLS certificate could be set.

[smira]

Also fix some minor bugs.

[smira]

With this patch, we can pass SSL options used when making request:

self.deproxy.make_request(..., ssl_options={'keyfile': '...key', 'certfile': '...crt'})

[izrik]

@smira I've added you to this project as a collaborator, since you seem committed to the project. =) Feel free to merge PR's as you see fit. Did you still need me to do code review?

[smira]

@izrik thanks for adding me as a collaborator. I'm posting PRs so that I can track all the changes. I should probably add some tests to each of the PRs and merge them afterwards.