Add PDF option to latexmkrc

.gitmodules

@@ -0,0 +1,3 @@
+[submodule "lib/latex-common"]
+	path = lib/latex-common
+	url = ssh://git@git.mercurial-manifold.eu:2224/an.tsouchlos/latex-common.git

.latexmkrc

@@ -1,2 +1,3 @@
 $pdflatex="pdflatex -shell-escape -interaction=nonstopmode -synctex=1 %O %S";
 $out_dir = 'build';
+$pdf_mode = 1;