Added setTabSize()

JsonGenerator/IndentedPrint.h

@@ -19,6 +19,7 @@ namespace ArduinoJson
                 : sink(p)
             {
                 level = 0;
+                tabSize = 1;
                 isNewLine = true;
             }
 
@@ -26,13 +27,18 @@ namespace ArduinoJson
 
             void indent();
             void unindent();
+            void setTabSize(uint8_t n);
 
         private:
             Print& sink;
-            uint8_t level : 7;
+            uint8_t level : 4;
+            uint8_t tabSize : 3;
             bool isNewLine : 1;
-
+            
             size_t writeTabs();
+
+            const int MAX_LEVEL = 15; // because it's only 4 bits
+            const int MAX_TAB_SIZE = 7; // because it's only 3 bits
         };
     }
 }