Moved Print::write() implementation into Print.cpp

JsonGeneratorTests/Print.cpp

@@ -0,0 +1,16 @@
+/*
+ * Arduino JSON library
+ * Benoit Blanchon 2014 - MIT License
+ */
+
+#include "Print.h"
+
+size_t Print::write(const char* s)
+{
+    size_t n = 0;
+    while (*s)
+    {
+        n += write(*s++);
+    }
+    return n;
+}