util/release: Support custom Docker registry & user

Signed-off-by: Lewis Marshall <lewis@lmars.net>
pinkerton: Support BasicAuth with Docker endpoints

Signed-off-by: Lewis Marshall <lewis@lmars.net>
website: Document releasing Flynn

Signed-off-by: Lewis Marshall <lewis@lmars.net>
util/packer: Handle existing fuse group

Signed-off-by: Lewis Marshall <lewis@lmars.net>
Merge pull request #387 from flynn/fix-packer-build

util/packer: Handle existing fuse group
Merge pull request #382 from flynn/custom-docker-repository

Custom Docker registry / user
script: use spaces for indents

Signed-off-by: Corey Powell <mistdragon100@gmail.com>
script: limit lines to 80 characters (where it makes sense)

And moved lines with [default: ] into a new line, though, I think that was
a bad idea.

Signed-off-by: Corey Powell <mistdragon100@gmail.com>
script: moved `sha256` function into a util.sh lib script

Signed-off-by: Corey Powell <mistdragon100@gmail.com>
script: cleaned up case statement branches

Signed-off-by: Corey Powell <mistdragon100@gmail.com>
script: brace quote variables in strings

Signed-off-by: Corey Powell <mistdragon100@gmail.com>
script: quote flip flop

Signed-off-by: Corey Powell <mistdragon100@gmail.com>
script: split long line in aws.sh

Signed-off-by: Corey Powell <mistdragon100@gmail.com>
script: Move [default: ] back to there preceding line

Signed-off-by: Corey Powell <mistdragon100@gmail.com>
script: use `[[` instead of `[` for if statements

Signed-off-by: Corey Powell <mistdragon100@gmail.com>
script: use double quotes for strings

unless there is a double quote in the string

Signed-off-by: Corey Powell <mistdragon100@gmail.com>
script: refactored slugrunner/runner/init

Signed-off-by: Corey Powell <mistdragon100@gmail.com>
script: refactored slugbuiler shell scripts

Signed-off-by: Corey Powell <mistdragon100@gmail.com>
script: re-add missing -k option to release-vm-images

I messed up somewhere >:

Signed-off-by: Corey Powell <mistdragon100@gmail.com>
script: Fix indents, refix indents, split stuff

Fixes that I knew I did before but managed to revert after I rebased.

Signed-off-by: Corey Powell <mistdragon100@gmail.com>