This closes #33.
This closes #33.

Merge remote-tracking branch 'd3zd3z/zephyr' into develop

* d3zd3z/zephyr:
  newt: Prepare support for header padding
  newt: Prepare support for header skipping
  newt: image: Handle ecdsa keys from openssl

apache/incubator-mynewt-newt,apache/incubator-mynewt-newt