Updated backup-restore howto

Updated backup-restore howto to reflect current state of
the process for HA
Merge branch 'master' of https://github.com/juju/docs
Added high availability docs

Added the ensure-availability command to the commands list
Added a brief howto on how to use ensure-availability
Adding more information on the relation-ids command.
Merge pull request #113 from mbruzek/relation-ids

Adding more information on the relation-ids command.
unclear information 

it was not obvious immediately where is Ubuntu, Mac OSX and Windows specific information
remove excessive info
cleanup
Merge pull request #114 from tyloch/patch-3

fix mac/win/linux headers
added meta parsing

added meta parsing extension. This does nothing to files which have no metadata, but is important for filtering out metadata when it gets added.
Correct typo
Merge pull request #116 from chuckbutler/boostrap

Correct typo in troubleshooting-local
testing metadata
Update the HP Cloud Config to work with version 13.5 AKA Horizon. The old regions were desupported this week.
Merge pull request #119 from sinzui/hp-new-region

Update the HP Cloud Config to work with version 13.5 AKA Horizon.
Correct the sshuttle command on the config page
Merge pull request #120 from chuckbutler/fix_vagrant_sshuttle

Correct the sshuttle command on the config page
Add Note about using .pem instead of a .cer.
Merge pull request #121 from castrojo/azure-cert

Add Note about using .pem instead of a .cer.
Delete debug-log caveat from local-provider docs

The bug was fixed a while ago; debug-log now works
uniformly across all providers.