Add delegation passphrase env var

Vendor notary for docker 1.11, with flattened keystore and raw messag…

…e pointer

Notary version for Docker 1.11

Notary 0.2 release

Fixes delegation path restriction and role name restriction for docke…

…r 1.10.2

updates and bugfixes for go 1.6

Signed-off-by: David Lawrence <[email protected]> (github: endophage)

Merge pull request notaryproject#508 from docker/log-level

move verifier and update logs down to debug level

Merge pull request notaryproject#499 from jfrazelle/update-url

change url from jfrazelle/go to docker/go

Revendor notary with fixes for docker 1.10

Re-vendoring into docker.