Added features related with curlopt_readfunction (for setting and using read function), so users can read data from local machine and send the data to server.

Added curlopt_put and other constance to {CURL_OPT_CONSTATNS} which used by {CURL_EASY_EXTERNALS}

Contributed by Heiko Gering 

git-svn-id: https://svn.origo.ethz.ch/eiffelstudio/trunk/Src/library/cURL@77404 8089f293-4706-0410-a29e-feb5c42a2edf

curl_default_function.e

@@ -1,4 +1,4 @@
-note
+indexing
 	description: "[
 					Default implementation of CURL_FUNCTION.
 																				]"
@@ -48,6 +48,11 @@ feature -- Command
 			end
 		end
 
+	read_function (a_data_pointer: POINTER; a_size, a_nmemb: INTEGER; a_object_id: POINTER): INTEGER
+			-- A callback readfunction
+		do
+		end
+
 	debug_function (a_curl_handle: POINTER; a_curl_infotype: INTEGER; a_char_pointer: POINTER; a_size: INTEGER; a_object_id: POINTER): INTEGER
 			-- Redefine
 		local