adds staging_clean script
adds staging_clean script

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