Added coverage related files to .gitignore.
Added coverage related files to .gitignore.

temka1234/pkgcloud,Phanatic/pkgcloud,Hopebaytech/pkgcloud,apla/pkgcloud,bunglestink/pkgcloud,songanbui/pkgcloud,pkgcloud/pkgcloud,mcanthony/pkgcloud,hacor/pkgcloud,dionjwa/pkgcloud,DonSchenck/pkgcloud,Phanatic/pkgcloud,andrewsomething/pkgcloud,mdsummers/pkgcloud