Remove graphviz from the sign_up_sheet_controller
Remove graphviz from the sign_up_sheet_controller

urmilparikh95/expertiza,expertiza/expertiza,sid5788/expertiza,mhhassan/expertiza,arpitashekhar/expertiza,expertiza/expertiza,urmilparikh95/expertiza,joshio1/expertiza,redsock88/expertiza,urmilparikh95/expertiza,ApertureScienceInnovators/expertiza,KunmiaoYang/expertiza,redsock88/expertiza,sid5788/expertiza,mhhassan/expertiza,rmmaily/expertiza,sid5788/expertiza,rmmaily/expertiza,urmilparikh95/expertiza,ApertureScienceInnovators/expertiza,rmmaily/expertiza,akshayjain114/expertiza,ApertureScienceInnovators/expertiza,akshayjain114/expertiza,kira0992/expertiza,rmmaily/expertiza,joshio1/expertiza,michaelamoran/expertiza,redsock88/expertiza,arpitashekhar/expertiza,redsock88/expertiza,expertiza/expertiza,michaelamoran/expertiza,michaelamoran/expertiza,kira0992/expertiza,sid5788/expertiza,expertiza/expertiza,KunmiaoYang/expertiza,joshio1/expertiza,ApertureScienceInnovators/expertiza,KunmiaoYang/expertiza,arpitashekhar/expertiza,akshayjain114/expertiza,kira0992/expertiza,michaelamoran/expertiza,arpitashekhar/expertiza,mhhassan/expertiza,kira0992/expertiza,KunmiaoYang/expertiza,mhhassan/expertiza,akshayjain114/expertiza,joshio1/expertiza