Fixed SD examples. (added include for SPI lib)

Author: cmaglie

examples/CardInfo/CardInfo.ino

@@ -20,6 +20,7 @@
  by Tom Igoe
  */
  // include the SD library:
+#include <SPI.h>
 #include <SD.h>
 
 // set up variables using the SD utility library functions:

examples/Datalogger/Datalogger.ino

@@ -20,6 +20,7 @@
  	 
  */
 
+#include <SPI.h>
 #include <SD.h>
 
 // On the Ethernet Shield, CS is pin 4. Note that even if it's not

examples/DumpFile/DumpFile.ino

@@ -20,6 +20,7 @@
  	 
  */
 
+#include <SPI.h>
 #include <SD.h>
 
 // On the Ethernet Shield, CS is pin 4. Note that even if it's not

examples/Files/Files.ino

@@ -17,6 +17,7 @@
  This example code is in the public domain.
  	 
  */
+#include <SPI.h>
 #include <SD.h>
 
 File myFile;

examples/ReadWrite/ReadWrite.ino

@@ -18,6 +18,7 @@
  	 
  */
 
+#include <SPI.h>
 #include <SD.h>
 
 File myFile;

examples/listfiles/listfiles.ino

@@ -17,6 +17,7 @@
  This example code is in the public domain.
  	 
  */
+#include <SPI.h>
 #include <SD.h>
 
 File root;