Added custom for provider priority

webpaste.el

@@ -108,8 +108,16 @@
                                (webpaste-return-url
                                 (request-response-header response "Location"))))))
        nil)))
-  "Define all webpaste.el providers.")
-
+  "Define all webpaste.el providers. Consists of provider name and lambda
+function to do the actuall call to the provider. The lamda should call
+webpaste-return-url with resulting url to return it to the user."
+  :group 'webpaste)
+
+(defcustom webpaste-provider-priority ()
+  "Define provider priority of which providers to try in which order. This
+variable should be a list of strings and if it isn't defined it will default
+to all providers in order defined in webpaste-providers list."
+  :group 'webpaste)
 
 (provide 'webpaste)