Added simple HTTP client.

For now the implementation is using Eiffel cURL library.
It requires Eiffel cURL coming with next EiffelStudio 7.0 (or from eiffelstudio's repo from rev#87244 )

library/client/http_client/src/http_client_constants.e

@@ -0,0 +1,37 @@
+note
+	description: "Summary description for {HTTP_CLIENT_CONSTANTS}."
+	author: ""
+	date: "$Date$"
+	revision: "$Revision$"
+
+class
+	HTTP_CLIENT_CONSTANTS
+
+feature -- Auth type
+
+	auth_type_id (a_auth_type_string: READABLE_STRING_8): INTEGER
+		local
+			s: STRING_8
+		do
+			create s.make_from_string (a_auth_type_string)
+			s.to_lower
+			if s.same_string_general ("basic") then
+				Result := Auth_type_basic
+			elseif s.same_string_general ("digest") then
+				Result := Auth_type_digest
+			elseif s.same_string_general ("any") then
+				Result := Auth_type_any
+			elseif s.same_string_general ("anysafe") then
+				Result := Auth_type_anysafe
+			elseif s.same_string_general ("none") then
+				Result := Auth_type_none
+			end
+		end
+
+	Auth_type_none: INTEGER = 0
+	Auth_type_basic: INTEGER = 1
+	Auth_type_digest: INTEGER = 2
+	Auth_type_any: INTEGER = 3
+	Auth_type_anysafe: INTEGER = 4
+
+end