Changed sed invocations for Debian/Ubuntu
Changed sed invocations for Debian/Ubuntu

Now that we are running this script on Debian/Ubuntu, we need to change
the syntax used with the -i flag from the previous "Mac OS X sed" syntax.

kelcecil/securedrop,jaseg/securedrop,chadmiller/securedrop,pwplus/securedrop,conorsch/securedrop,ehartsuyker/securedrop,jrosco/securedrop,jeann2013/securedrop,jrosco/securedrop,micahflee/securedrop,jaseg/securedrop,chadmiller/securedrop,GabeIsman/securedrop,garrettr/securedrop,pwplus/securedrop,jrosco/securedrop,garrettr/securedrop,ageis/securedrop,harlo/securedrop,ehartsuyker/securedrop,jrosco/securedrop,ehartsuyker/securedrop,conorsch/securedrop,jaseg/securedrop,harlo/securedrop,kelcecil/securedrop,kelcecil/securedrop,GabeIsman/securedrop,jrosco/securedrop,ehartsuyker/securedrop,garrettr/securedrop,pwplus/securedrop,jeann2013/securedrop,jaseg/securedrop,pwplus/securedrop,ehartsuyker/securedrop,GabeIsman/securedrop,ehartsuyker/securedrop,pwplus/securedrop,jrosco/securedrop,GabeIsman/securedrop,jeann2013/securedrop,pwplus/securedrop,jaseg/securedrop,micahflee/securedrop,conorsch/securedrop,garrettr/securedrop,micahflee/securedrop,ageis/securedrop,jeann2013/securedrop,ageis/securedrop,micahflee/securedrop,conorsch/securedrop,harlo/securedrop,kelcecil/securedrop,heartsucker/securedrop,kelcecil/securedrop,jeann2013/securedrop,heartsucker/securedrop,harlo/securedrop,harlo/securedrop,jaseg/securedrop,GabeIsman/securedrop,harlo/securedrop,GabeIsman/securedrop,jeann2013/securedrop,chadmiller/securedrop,kelcecil/securedrop,heartsucker/securedrop,chadmiller/securedrop,heartsucker/securedrop,conorsch/securedrop,heartsucker/securedrop,chadmiller/securedrop,chadmiller/securedrop,ageis/securedrop