draft intercept for mechanize (redux)
update docs to reflect mechanize support in py2
require recent mechanize
Merge pull request #16 from sashahart/mechanize_intercept

Mechanize intercept
Add known to fail tests for https in http.client

Related to #17 and #21.

I'm not sure how to fix this, but wanted to get the test in place
to indicate the there is awareness of the problem.

Also updated the README with a bit more info.
release 0.7.0
test both implicit and explicit ports 80/443