Added standard UEL implementation + Guice module

Signed-off-by: Sebastian Hoß <mail@shoss.de>
Mention new EL 3.0

Signed-off-by: Sebastian Hoß <mail@shoss.de>
EL expressions now have to be inside of ${ .. }

Signed-off-by: Sebastian Hoß <mail@shoss.de>
Added link to guice-uel wiki page

Signed-off-by: Sebastian Hoß <mail@shoss.de>