Add Woolworths Categories extraction as new example

Use ```perl t/Woolworthsonline_Categories.t``` to test this Example.

```
ok 1 - use LWP::UserAgent;
ok 2 - use HTTP::Cookies;
ok 3 - use HTML::TokeParser;
ok 4 - use Regexp::Common;
ok 5 - use Valentine::Logging;
ok 6 - use Valentine::Parser;
ok 7 - use Valentine::Rules::WoolWorths::Categories;
ok 8 - Woolworths Online
ok 9 - Items: 34
1..9
```