changes: * buildPhase = "true" * buildPhase = ":"
`cp`, `grep`, `chmod`, `sed` executables no longer found when upgrading from nixos 15.09 to 16.03. Fixed by use of wrapper script that brings these executables into `PATH`. Also fix lpd binaries on 64 bits machines by use of `callPackage_i686`.
Brother generic cups wrapper over lpr driver `brgenml1lpr` init at same version.