update snapshot structure. clarify hard link use.
Merge pull request #61 from github/file-structure-doc

update snapshot structure. clarify hard link use.
Add link to Migrations documentation
Merge pull request #63 from github/migrations

Add link to Migrations documentation
Make v0.9 ES backup strategy work against GHE v2.0 appliances

The elasticsearch directory is now owned and readable by the
elasticsearch user only.
Move back to single es backup script

We're going to hold off on the ES snapshot API approach until a
future release.
Use rsync instead tar for transferring v11.10.x ES backups to appliance

We needed to use tar for transferring to v11.10.x instances because
we didn't have sudo for controlling permissions on the resulting
files. We can just use rsync directly under v2.x.
Transfer ES backups to elasticsearch-restore directory

The ghe-config-apply command on the VM detects this directory and
moves into the active location.
Fix up backup/restore tests for ES changes
Merge pull request #12 from github/rollback-es-snapshot-api

Rollback to ES disable flush backup method for v2.x appliances
Fix typo in comment
Change "indexes" to "indices" for consistency
remove GNU tar requirement for restoring to 2. add error message.
Merge pull request #67 from github/no-gtar

remove GNU tar requirement for restoring to 2. add error message.
Merge pull request #65 from github/update-comments

Fix typo in comment
Merge backup-utils/master changes

Conflicts:
	libexec/ghe-restore-es-rsync
Better requirements section headers in TOC
Misc README cleanup
Fix hardcoded cool down time in error message
Wait for git-nw-repack procs to finish before transferring repositories

Fixes a potential issue with in progress git-nw-repack processes
finishing while the rsync transfer is in process, which could result
in pack files being removed before they're transferred.