add new sample for beamer slides

Signed-off-by: Sebastien Varrette <sebastien.varrette@uni.lu>
abstract branchs

Signed-off-by: Sebastien Varrette <sebastien.varrette@uni.lu>
update LaTeX style

Signed-off-by: Sebastien Varrette <sebastien.varrette@uni.lu>
add PDF version of the sample slide

Signed-off-by: Sebastien Varrette <sebastien.varrette@uni.lu>
upgrade git submodules

Signed-off-by: Sebastien Varrette <sebastien.varrette@uni.lu>
upgrade style

Signed-off-by: Sebastien Varrette <sebastien.varrette@uni.lu>