stop passing -d <app domain> as the CLI detects it

Signed-off-by: Johannes Tuchscherer <jtuchscherer@pivotallabs.com>
turn AppQueryResponse into GenericResponse

so far there's nothing particularly Appy about it

Signed-off-by: Johannes Tuchscherer <jtuchscherer@pivotallabs.com>
fix bin/test passing arguments to ginkgo

interesting: "$@" expands into "$1" "$2" "$3" [...]

Signed-off-by: Johannes Tuchscherer <jtuchscherer@pivotallabs.com>
add admin buildpack tests

includes a (pending) test for the disabling of buildpacks feature

Signed-off-by: Johannes Tuchscherer <jtuchscherer@pivotallabs.com>