Use a new twister-rpc function to wrap all calls

This method encapsulates the connection and closes it too, so there
won't be processes left behind.
Performance wise, this is probably not the smartest thing to do, but
that is of no concern at this time.

twister.el

@@ -67,20 +67,27 @@ twister.conf file"
   :type 'integer
   :group 'twister)
 
-
-;; Get a connection to the twister daemon
-(setf twisterd (json-rpc-connect
-                twister-host twister-port
-                twister-rpcuser twister-rpcpassword))
-
 ;; Preliminary convention
 ;; tw-* methods      -> sorta private for now, don't use directly
 ;; twister-* methods -> public API
+(defun twister-rpc (method &rest params)
+  "Wrapper for the json-rpc method for twister use.
+The connection is closed afer each use.  This is not necessarily
+the most effective.  METHOD is the RPC method we are calling
+while PARAMS contain the rest of the parameters."
+
+  (let* ((twisterd (json-rpc-connect
+                    twister-host twister-port
+                    twister-rpcuser twister-rpcpassword))
+
+         (result (apply 'json-rpc twisterd method params)))
+    (json-rpc-close twisterd)
+    result))
 
 (defun tw-get-last-post(user)
   "Get the last post of a user"
   (let (obj (json-new-object))
-    (json-rpc twisterd "getposts" 1
+    (twister-rpc "getposts" 1
               (vector (json-add-to-object obj "username" user)))))
 
 (defun tw-get-next-k(user)
@@ -95,12 +102,10 @@ twister.conf file"
   "Post msg to the configured twister daemon"
   (interactive)
 
-  (json-rpc
-   twisterd "newpostmsg"
+  (twister-rpc "newpostmsg"
    twister-user
    (tw-get-next-k twister-user) msg))
 
-
 (defun twister-post-region (begin end)
   "Post the current region to twister"
   (interactive "r")