adds section on spectest layout to docs
adds section on spectest layout to docs

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