Update gitignore to include HTML preview files.
Update gitignore to include HTML preview files.

lindegroup/autopkgr,lindegroup/autopkgr,eahrold/autopkgr,eahrold/autopkgr,HyppHere/autopkgr,ftiff/autopkgr,lindegroup/autopkgr,lindegroup/autopkgr,lindegroup/autopkgr,eahrold/autopkgr,HyppHere/autopkgr,ftiff/autopkgr,HyppHere/autopkgr,ftiff/autopkgr