Added getChannel Method to allow for verification of the configured channel

RF24.cpp

@@ -452,6 +452,11 @@ void RF24::setChannel(uint8_t channel)
   write_register(RF_CH,rf24_min(channel,max_channel));
 }
 
+uint8_t RF24::getChannel()
+{
+  
+  return read_register(RF_CH);
+}
 /****************************************************************************/
 
 void RF24::setPayloadSize(uint8_t size)

RF24.h

@@ -709,6 +709,13 @@ s   *
    * @param channel Which RF channel to communicate on, 0-127
    */
   void setChannel(uint8_t channel);
+  
+    /**
+   * Get RF communication channel
+   *
+   * @return The currently configured RF Channel
+   */
+  uint8_t getChannel(void);
 
   /**
    * Set Static Payload Size