IPv6 literal support (#330)

Apply patch from:
master...foca:ipv6_support

I added a test that checks requests localhost (::1) works.

lib/em-http/http_client_options.rb

@@ -34,7 +34,7 @@ def set_uri(uri, path = nil, query = nil)
 
     @uri = uri
     @path = uri.path
-    @host = uri.host
+    @host = uri.hostname
     @port = uri.port
     @query = query
 

lib/em-http/http_connection.rb

@@ -227,9 +227,9 @@ def connection_completed
       @peer = @conn.get_peername
 
       if @connopts.socks_proxy?
-        socksify(client.req.uri.host, client.req.uri.inferred_port, *@connopts.proxy[:authorization]) { start }
+        socksify(client.req.uri.hostname, client.req.uri.inferred_port, *@connopts.proxy[:authorization]) { start }
       elsif @connopts.connect_proxy?
-        connectify(client.req.uri.host, client.req.uri.inferred_port, *@connopts.proxy[:authorization]) { start }
+        connectify(client.req.uri.hostname, client.req.uri.inferred_port, *@connopts.proxy[:authorization]) { start }
       else
         start
       end

lib/em-http/http_connection_options.rb

@@ -20,15 +20,15 @@ def initialize(uri, options)
     uri = uri.kind_of?(Addressable::URI) ? uri : Addressable::URI::parse(uri.to_s)
     @https = uri.scheme == "https"
     uri.port ||= (@https ? 443 : 80)
-    @tls[:sni_hostname] = uri.host
+    @tls[:sni_hostname] = uri.hostname
 
     @proxy = options[:proxy] || proxy_from_env
 
     if proxy
       @host = proxy[:host]
       @port = proxy[:port]
     else
-      @host = uri.host
+      @host = uri.hostname
       @port = uri.port
     end
   end

spec/client_spec.rb

@@ -977,4 +977,24 @@ def failed(http=nil)
       }
     end
   end
+
+  context "IPv6" do
+    it "should perform successful GET" do
+      EventMachine.run {
+        @s = StubServer.new({
+          response: "HTTP/1.1 200 OK\r\n\r\nHello IPv6",
+          port: 8091,
+          host: '::1',
+        })
+        http = EventMachine::HttpRequest.new('http://[::1]:8091/').get
+
+        http.errback { failed(http) }
+        http.callback {
+          http.response_header.status.should == 200
+          http.response.should match(/Hello IPv6/)
+          EventMachine.stop
+        }
+      }
+    end
+  end
 end