Cleaning up Mac build, adding Serial.println(unsigned int), adding #include <Sprite.h> to hello_matrix example.

cores/arduino/HardwareSerial.cpp

@@ -138,6 +138,12 @@ void HardwareSerial::println(int n)
   println();
 }
 
+void HardwareSerial::println(unsigned int n)
+{
+  print(n);
+  println();
+}
+
 void HardwareSerial::println(long n)
 {
   print(n);

cores/arduino/HardwareSerial.h

@@ -52,6 +52,7 @@ class HardwareSerial
     void println(const char[]);
     void println(uint8_t);
     void println(int);
+    void println(unsigned int);
     void println(long);
     void println(unsigned long);
     void println(long, int);

libraries/Matrix/examples/hello_matrix/hello_matrix.pde

@@ -1,3 +1,4 @@
+#include <Sprite.h>
 #include <Matrix.h>
 
 // Hello Matrix