added two examples to String examples for String to integer conversion

build/shared/examples/8.Strings/StringToInt/StringToInt.pde

@@ -0,0 +1,50 @@
+/*
+  String to Integer conversion
+ 
+ Reads a serial input string until it sees a newline, then converts
+ the string to a number if the characters are digits.
+ 
+ The circuit:
+ No external components needed.
+ 
+ created 29 Nov 2010
+ by Tom Igoe
+ 
+ This example code is in the public domain. 
+ */
+
+// include the character conversion functions:
+#include <WCharacter.h>
+
+String inString = "";    // string to hold input
+
+void setup() {
+  // Initialize serial communications:
+  Serial.begin(9600);
+}
+
+void loop() {
+  // Read serial input:
+  while (Serial.available() > 0) {
+    int inChar = Serial.read();
+    if (isDigit(inChar)) {
+      // convert the incoming byte to a char 
+      // and add it to the string:
+      inString += (char)inChar; 
+    }
+    // if you get a newline, print the string,
+    // then the string's value:
+    if (inChar == '\n') {
+      Serial.print("Value:");
+      Serial.println(inString.toInt());
+      Serial.print("String: ");
+      Serial.println(inString);
+      // clear the string for new input:
+      inString = ""; 
+    }
+  }
+}
+
+
+
+