pkg: Add cliutil package with JSON helper

Signed-off-by: Jonathan Rudenberg <jonathan@titanous.com>
all: Move release download command to flynn-host

Signed-off-by: Jonathan Rudenberg <jonathan@titanous.com>
script: Remove flynn-release from deb package

The only reason this was in the deb was to provide the
`flynn-release download` command which is now provided by the
flynn-host binary.

Signed-off-by: Jonathan Rudenberg <jonathan@titanous.com>
Merge pull request #446 from flynn/combine-binaries

Move release download command to flynn-host