stage1: gitignore stage1/cache
Documentation: Add 'gpg' to build pre-requisites

Commit 00294ed ("stage1: gpg verify and cache retrieved coreos image")
added a dependency to 'gpg'. Add that to list of build pre-requisites.

Signed-off-by: Pekka Enberg <penberg@cloudius-systems.com>
stage1: add / to stage1/cache gitignore entry
Merge pull request #220 from penberg/docs/build-gpg

Documentation: Add 'gpg' to build pre-requisites
Merge pull request #216 from jzelinskie/ignore-cache

stage1: gitignore stage1/cache
Documentation: Adding version to hello world example

The actool is failing when validating the manifest.json, as version is missing.
stage1: generate a socket unit for socket-activated ports

 * Generate a systemd socket unit for socket-activated ports
 * Add socket-related path generators and cleanup rest
 * Remove unnecessary systemd unit path mkdirs, just trust the
   stage1 rootfs provides them.
Merge pull request #214 from vcaputo/socketactivation

stage1: generate socket unit for socket-activated ports
stage1/init: mirror host's /etc/localtime symlink target in rootfs

This suppresses the warning when systemd-nspawn tries recreating the host's
/etc/localtime symlink in the container filesystem.
Merge pull request #226 from vcaputo/mirrorlocalzoneinfo

stage1/init: mirror host's /etc/localtime symlink target in rootfs
fix etcd sha256 in README.md

following the instructions I get a different hash:

$ wget -q https://github.com/coreos/etcd/releases/download/v0.5.0-alpha.4/etcd-v0.5.0-alpha.4-linux-amd64.aci
$ gzip -dc etcd-v0.5.0-alpha.4-linux-amd64.aci > etcd-v0.5.0-alpha.4-linux-amd64.tar
$ sha256sum etcd-v0.5.0-alpha.4-linux-amd64.tar
f9215c18b86f406c7cec4c7b45fd8752b5bfd1a492507d647821c2ce593fbf31 etcd-v0.5.0-alpha.4-linux-amd64.tar
Merge pull request #229 from filippog/fix/etcd-sha256

fix etcd sha256 in README.md
cas: write download progress to stdout

This introduces ProgressReader, a reader proxy that keeps track of total
bytes read and executes a callback.

Fixes #208