Fixed commands in bootstrap instructions.

The top-level directory in the tarball pulled down from GitHib is named 
`chef-server-BRANCH` when we just want to extract to a directory named 
`chef-server`.

Big thanks to Matthew Ratzloff for pointing out the issue!
Fix spelling typo in log statement.
option names in chef-server config should be underscore, not dash, separated

* be a good citizen and replace dashes with underscores when rendering template
* fix "disable chef-server-webui" example in README
update Vagrantfile to point at latest release version
update list of supported platforms Omnibus packages are available for
Adding a check on the type of the tunable, so that things like 'notification_email' can be set directly and not on a subcomponent.
Added documentation for chef-server tunables
Merge pull request #23 from greenalto/document_configuration

Added documentation for chef-server tunables
Merge pull request #22 from gabemc/master

Fixes `notification_email` setting
COOK-2556 - Change IP of Vagrant VM to avoid conflicts with other cookbook Vagrant VMs.

All Berkshelf Vagrantfiles spin up on :hostonly network IP of 33.33.33.10 by default. This change will modify the IP of the chef-server Vagrant guest, so that client Vagrant guests can run simultaneously without modification to any files.
Merge branch 'COOK-2556'
Update to cookbook to support Vagrant 1.1+

Vagrant 1.1+ is now installed system-wide so the Bundler requirement
(and associated Gemfile) have been removed! The README has been
updated to reflect new demo/dev environment installation and usage
instructions.
fixing foodcritic alerts
Merge pull request #28 from ranjib/foodcritic_fix

[COOK-2953] chef-server cookbook has foodcritic failures
Prevent re-download
Merge pull request #26 from Youscribe/create_if_missing

[COOK-2821] Prevent re-download