Merge pull request #3055 from daboe01/cpstring+-containsString

fixed: CPString did not have containsString:

Foundation/CPString.j

@@ -570,6 +570,16 @@ var CPStringNull = [CPNull null];
     return aString && aString != "" && self.indexOf(aString) == 0;
 }
 
+/*!
+ Returns \c YES if the receiver contains
+ the specified string. If \c aString
+ is empty, the method will return \c NO.
+ */
+- (BOOL)containsString:(CPString)aString
+{
+    return aString && aString != "" && self.indexOf(aString) >= 0;
+}
+
 /*!
     Returns \c YES if the receiver ends
     with the specified string. If \c aString