Added support of long long (issue #171)

Moved all build settings to `ArduinoJson/Configuration.hpp`
Added AppVeyor settings in source tree

include/ArduinoJson/Arduino/Print.hpp

@@ -9,8 +9,19 @@
 
 #ifndef ARDUINO
 
+#include "../Internals/JsonFloat.hpp"
+#include "../Internals/JsonInteger.hpp"
+
 #include <stddef.h>
 #include <stdint.h>
+#include <stdio.h>
+
+#if defined(_MSC_VER) && _MSC_VER <= 1800
+// snprintf has been added in Visual Studio 2015
+#define ARDUINOJSON_SNPRINTF _snprintf
+#else
+#define ARDUINOJSON_SNPRINTF snprintf
+#endif
 
 // This class reproduces Arduino's Print class
 class Print {
@@ -19,11 +30,56 @@ class Print {
 
   virtual size_t write(uint8_t) = 0;
 
-  size_t print(const char[]);
-  size_t print(double, int = 2);
-  size_t print(int);
-  size_t print(long);
-  size_t println();
+  size_t print(const char* s) {
+    size_t n = 0;
+    while (*s) {
+      n += write(*s++);
+    }
+    return n;
+  }
+
+  size_t print(ArduinoJson::Internals::JsonFloat value, int digits = 2) {
+    char tmp[32];
+
+    // https://github.com/arduino/Arduino/blob/db8cbf24c99dc930b9ccff1a43d018c81f178535/hardware/arduino/sam/cores/arduino/Print.cpp#L220
+    bool isBigDouble = value > 4294967040.0 || value < -4294967040.0;
+
+    if (isBigDouble) {
+      // Arduino's implementation prints "ovf"
+      // We prefer using the scientific notation, since we have sprintf
+      ARDUINOJSON_SNPRINTF(tmp, sizeof(tmp), "%g", value);
+    } else {
+      // Here we have the exact same output as Arduino's implementation
+      ARDUINOJSON_SNPRINTF(tmp, sizeof(tmp), "%.*f", digits, value);
+    }
+
+    return print(tmp);
+  }
+
+  size_t print(ArduinoJson::Internals::JsonInteger value) {
+    // see http://clc-wiki.net/wiki/K%26R2_solutions:Chapter_3:Exercise_4
+    char buffer[22];
+
+    size_t n = 0;
+    if (value < 0) {
+      value = -value;
+      n += write('-');
+    }
+    uint8_t i = 0;
+    do {
+      ArduinoJson::Internals::JsonInteger digit = value % 10;
+      value /= 10;
+      buffer[i++] = static_cast<char>(digit >= 0 ? '0' + digit : '0' - digit);
+    } while (value);
+
+    while (i > 0) {
+      n += write(buffer[--i]);
+    }
+
+    return n;
+  }
+
+  size_t println() { return write('\r') + write('\n'); }
 };
 
 #else