Write tests for no_proxy handling.
Implement no_proxy handling.
Add some documentation on https?_proxy + no_proxy.
Add a test to ensure no_proxy (lowercase) is respected.
Fix hostname handling in no_proxy support. Add more tests.
Make sure no_proxy hostname matching is not case sensitive.
Update no_proxy tests messages and comments.
Merge pull request #1096 from samcday/no_proxy-support

No_proxy support