Directives

You can denote directives with <%@ %>. They allow one to control aspects of the controlling servlet.
They must be of the form
```
<%@ directive attribute="value" %>
```
were the main directives are
1. page lets you import classes, set content type, and other servlet costumizations.
2. include lets you insert a file inte the JSP at compile time.
3. taglib defines custom markup tags.