A buncha muncha cruncha .h docs. Also add vim temporary files to .gitignore.

src/ssb.rpc.h

@@ -7,9 +7,19 @@
 ** @{
 */
 
+/** An SSB instance. */
 typedef struct _tf_ssb_t tf_ssb_t;
 
+/**
+** Register standard muxrpc callbacks.
+** @param ssb The SSB instance.
+*/
 void tf_ssb_rpc_register(tf_ssb_t* ssb);
+
+/**
+** Start periodic SSB maintenance tasks.
+** @param ssb The SSB instance.
+*/
 void tf_ssb_rpc_start_periodic(tf_ssb_t* ssb);
 
 /** @} */