v0.18.0

Updated dependencies

• nerves_system_br v0.14.0

  • Buildroot 2017.08
  • fwup 0.17.0
  • erlinit 1.2.0
  • nbtty 0.3.0

• Enhancements

  • Add global patch directory

  This is required to pull in the e2fsprogs patch that's needed now that
  util-linux's uuid_generate function calls getrandom and can block
  indefinitely for the urandom pool to initialize

• Bug Fixes

  • Use nbtty by default to fix tty hang issue