Fix some chars (!, =, etc) being treated as not allowed in userinfo of authority

hyper/packages/rfc3986/misc.py

@@ -124,7 +124,7 @@
 HOST_PATTERN = '({0}|{1}|{2})'.format(reg_name, ipv4, ip_literal)
 
 SUBAUTHORITY_MATCHER = re.compile((
-    '^(?:(?P<userinfo>[A-Za-z0-9_.~\-%:]+)@)?'  # userinfo
+    '^(?:(?P<userinfo>[A-Za-z0-9\-._~%!$&\'()*+,;=:]+)@)?'  # userinfo
     '(?P<host>{0}?)'  # host
     ':?(?P<port>\d+)?$'  # port
     ).format(HOST_PATTERN))

test/test_hyper.py

@@ -67,6 +67,16 @@ def test_connections_accept_proxy_hosts_and_ports(self):
         assert c.proxy_host == 'localhost'
         assert c.proxy_port == 8443
 
+    def test_connections_can_parse_proxy_hosts_with_userinfo(self):
+        c = HTTP20Connection('www.google.com',
+                             proxy_host='azAz09!==:fakepaswd@localhost:8443')
+        # Note that the userinfo part is getting stripped out,
+        # it's not automatically added as Basic Auth header to
+        # the proxy_headers! It should be done manually.
+        assert c.host == 'www.google.com'
+        assert c.proxy_host == 'localhost'
+        assert c.proxy_port == 8443
+
     def test_connections_can_parse_proxy_hosts_and_ports(self):
         c = HTTP20Connection('www.google.com',
                              proxy_host='localhost',