Add improvements from peer review and add Tails version
Add improvements from peer review and add Tails version

micahflee/securedrop,micahflee/securedrop,micahflee/securedrop,conorsch/securedrop,ageis/securedrop,ageis/securedrop,heartsucker/securedrop,ageis/securedrop,garrettr/securedrop,heartsucker/securedrop,heartsucker/securedrop,heartsucker/securedrop,garrettr/securedrop,garrettr/securedrop,ehartsuyker/securedrop,ehartsuyker/securedrop,heartsucker/securedrop,ehartsuyker/securedrop,conorsch/securedrop,micahflee/securedrop,ehartsuyker/securedrop,conorsch/securedrop,conorsch/securedrop,ageis/securedrop,ehartsuyker/securedrop,conorsch/securedrop,garrettr/securedrop,ehartsuyker/securedrop