adds packer formula

Packer comes delivered in a zip file containing precompiled binaries,
all of which are executables, however only the main 'packer' binary
is meant to be used by the operator, the others are called by the main
binary.

I didn't know if there was a better method to put these binaries into
place, so I used a wordlist loop. If there's a better method to do this,
I'm all ears.