Replace ghostscript with exiftool

[plessbd]

ghostscript was added to set proper pdf width and height, this can be done with rsvg-convert and the metadata can be added with exiftool use these tools instead as they are "smaller"

Another PR will be added to cleanup all the temporary files.

Url for exiftool comes from yum

$ yum info perl-Image-ExifTool
Loaded plugins: fastestmirror, ovl
Loading mirror speeds from cached hostfile
 * base: mirror.clarkson.edu
 * epel: ord.mirror.rackspace.com
 * extras: mirror.atlanticmetro.net
 * updates: mirror.atlanticmetro.net
Installed Packages
Name        : perl-Image-ExifTool
Arch        : noarch
Version     : 12.00
Release     : 1.el7
Size        : 15 M
Repo        : installed
From repo   : epel
Summary     : Utility for reading and writing image meta info
URL         : http://www.sno.phy.queensu.ca/%7Ephil/exiftool/
License     : GPL+ or Artistic
Description : ExifTool is a Perl module with an included command-line application for
            : reading and writing meta information in image, audio, and video files.
            : It reads EXIF, GPS, IPTC, XMP, JFIF, MakerNotes, GeoTIFF, ICC Profile,
            : Photoshop IRB, FlashPix, AFCP, and ID3 meta information from JPG, JP2,
            : TIFF, GIF, PNG, MNG, JNG, MIFF, EPS, PS, AI, PDF, PSD, BMP, THM, CRW,
            : CR2, MRW, NEF, PEF, ORF, DNG, and many other types of images. ExifTool
            : also extracts information from the maker notes of many digital cameras
            : by various manufacturers including Canon, Casio, FujiFilm, GE, HP,
            : JVC/Victor, Kodak, Leaf, Minolta/Konica-Minolta, Nikon, Olympus/Epson,
            : Panasonic/Leica, Pentax/Asahi, Reconyx, Ricoh, Samsung, Sanyo,
            : Sigma/Foveon, and Sony.