changed getTokenExclude method to allow escaped characters.

testing/zstring_test.cpp

@@ -111,5 +111,9 @@ int main(int argc, char **argv) {
    coreutils::ZString test21("10.00000000");
    std::cout << "Trailing Zeros: " << test21.removeTrailingZeros() << std::endl;
    std::cout << "                " << test21 << std::endl;
+
+   coreutils::ZString test22("This is a \\\"quoted\\\" string.\"");
+   std::cout << "quoted string: " << test22 << std::endl;
+   std::cout << "quoted string: " << test22.getTokenExclude("\"") << std::endl;      
    
 }