ADD: marshmellows new lf command and DetectClock. (works great!)

FIX: a suggested patch for "hf mf csetuid" (https://github.com/Proxmark/proxmark3/issues/35)
FIX: fixed a bug in iso14443a_select_card where the len variable wasnt set,  this made desfire/magic cards not work.

client/cmdlf.c

@@ -371,6 +371,9 @@ int CmdLFRead(const char *Cmd)
   }
   SendCommand(&c);
   WaitForResponse(CMD_ACK,NULL);
+  
+  // load samples 
+  CmdSamples("");
   return 0;
 }