adds spec:prod task to Rakefile
adds spec:prod task to Rakefile

Right now this is just a crude port of the staging tests,
to provide a starting point. Many of these tests will fail
against prod, since the tests and vars are reused.

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