actool: gzip application container image
stage0: stream image to avoid extra copy
pkg/tarheader: vet fix

Fix the following vet report:
  - pkg/tarheader/pop_darwin.go:1: +build comment must appear before package clause and be followed by a blank line
Merge pull request #131 from ceh/vet-fix

pkg/tarheader: vet fix
changes metadata IP as per #132
metadatasvc: changed sha1 to sha256

Although HMAC with sha1 is less affected by collisions than sha1 alone I personally think it's better to use sha256 since the beginning.
This has also the advantage of automatically increasing the key sizei, for the HMAC function, from 160 bits to 256, which consequently increases the HMAC strength.
Update SPEC.md

Removes duplicate 'the' in logging section.
Merge pull request #137 from lamielle/patch-1

appc/spec: fix typo
metadatasvc: wrapped initCrypto with log.Fatal

In case the HMAC key generation fails then do not allow the metadatasvc process execution to continue and print the error.
This avoids any potential security issues if there is not enough entropy in the system.
Merge pull request #129 from jonboulle/master

stage0: stream image to avoid extra copy
metadatasvc: checking the initCrypto error

Missed the real checking for the initCrypto error.
I have also taken the liberty to slightly change the printing of the error of the setupIPTables call to keep it consistant and use log.Fatal
metadatasvc: changed from fmt to log the setupIPTables

To keep the error handling consistant on the main function I changed the printing of the error from fmt + return to log.Fatal in the setupIPTables
appc/spec: clarify authors annotation
Merge pull request #141 from jonboulle/master

App Manifest authors format: wrong example?
README: Correct a few spellings/names
README: minor formatting tweaks

- Remove trailing whitespace
- Unwrap paragraphs, for consistency
appc/spec: remove duplicated line
appc: remove unnecessary bracket in README
Merge pull request #152 from azu/patch-1

appc: remove unnecessary bracket in README
*: remove historical RAF references