Add image/svg+xml to gzip_files defaults
Add image/svg+xml to gzip_files defaults

SVG compresses really well

Signed-off-by: Bradley Schaefer <af841d9716d664ce23dbda7e4ac0caa436aace1a@gmail.com>

miketheman/nginx,Roblox/chef_nginx,chef-cookbooks/chef_nginx,Roblox/chef_nginx,Roblox/chef_nginx,miketheman/nginx,Sauraus/chef_nginx,chef-cookbooks/chef_nginx,miketheman/nginx,Sauraus/chef_nginx,chef-cookbooks/chef_nginx,Sauraus/chef_nginx