Added command line options to specify the linear/circular duration.
Added command line options to specify the linear/circular duration.

olitheolix/azrael,daviddeng/azrael,olitheolix/azrael,olitheolix/azrael,daviddeng/azrael,olitheolix/azrael,daviddeng/azrael,daviddeng/azrael,daviddeng/azrael,olitheolix/azrael