Add CONNECT proxy support [Fixes #146]
Support Proxy-Authorization: Basic for CONNECT proxies
Default to CONNECT proxy for https requests

This is a more secure default than `:http`.
Merge proxy: {type: :connect} and {type: :http}
update to latest http_parser.rb (0.6 beta)
Merge branch 'em-connectify' of git://github.com/ConradIrwin/em-http-request
cleanup HTTP(S) proxy support, bump gemspec to latest deps
use 807x port range for redirect specs