cJSON_Version: returns a version string

This is useful to programmatically find out the version of cJSON that
has been used (useful in case of scripting language bindings for
example).

cJSON.c

@@ -58,6 +58,14 @@ const char *cJSON_GetErrorPtr(void)
     return global_ep;
 }
 
+extern const char* cJSON_Version(void)
+{
+    static char version[15];
+    sprintf(version, "%i.%i.%i", CJSON_VERSION_MAJOR, CJSON_VERSION_MINOR, CJSON_VERSION_PATCH);
+
+    return version;
+}
+
 /* case insensitive strcmp */
 static int cJSON_strcasecmp(const char *s1, const char *s2)
 {