Merge pull request #430 from andyg24/stop_mode_fix

Do a JTAG reset prior to reading CPU information, fixes #428 and #451.

src/usb.c

@@ -880,6 +880,7 @@ stlink_t *stlink_open_usb(enum ugly_loglevel verbose, bool reset, char serial[16
     }
 
     if (reset) {
+        stlink_jtag_reset(sl, 2);
         stlink_reset(sl);
         usleep(10000);
     }