Removing link to removed product page
Generate PDF using XeLaTeX
travis: Install xetex and gyre
conf.py: LaTeX font size is 10pt
merge dev_4_4 -D org -I include -E exclude: PR 261 (Generate PDF using XeLaTeX)
merge dev_4_4 -D org -I include -E exclude: PR 368 (Cpp: Correct content and markup)
merge dev_4_4 -D org -I include -E exclude: PR 436 (Product link removal)