Add page orientation property to camel-printer component

The printer component currently does not support specifying a page
orientation. The Java Print Service supports portrait, landscape,
reverse-portrait and reverse-landscape (see
javax.print.attribute.standard.OrientationRequested attribute).

The camel-printer component shall be extended to support an
additional configuration parameter "orientation" with the above mentioned
values "portrait", "landscape",
"reverse-portrait" and "reverse-landscape". The default page orientation shall be "portrait".

See also http://camel.465427.n5.nabble.com/camel-printer-with-page-orientation-td5745991.html