actool: gzip application container image
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.
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.
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
README: Correct a few spellings/names
README: minor formatting tweaks

- Remove trailing whitespace
- Unwrap paragraphs, for consistency
*: remove historical RAF references
appc/actool: only print output on success if debug=true
Update SPEC.md
added ubuntu trusty getting started guide
fix typo in ac-discovery spec
Merge pull request #113 from kelseyhightower/gzip-compress-aci-files

actool: gzip application container image
Merge pull request #133 from sthulb/patch-1

changes metadata IP as per #132
Merge pull request #159 from deepak1556/spec_patch

fix typo in ac-discovery spec
Merge pull request #157 from jbayer/master

added ubuntu trusty getting started guide
Merge pull request #148 from cespare/readme-fixes-2

Some minor README fixes
Cleaned up if statement
missing command line option in example.