Change tabs to spaces
standard config opt names: cluster monitoring
standard config opt names: node monitoring
standard config opt names: logging
update CoreOS installation guides

* CoreOS guides now use the 0.5.4 official release binaries
* kube-register has been updated to work with the 0.5.4 release
* flannel uses the vxlan backend by default for better performance
* cloud-configs are used for all examples
* instructions for GCE, AWS, and VMware Fusion have been combined
Merge pull request #2625 from kelseyhightower/update-to-0.5

update CoreOS installation guides
add union auth request handler
Merge pull request #2628 from deads2k/deads-add-union-request-authenticator

add union auth request handler
Merge pull request #2393 from thockin/enables

Enables
Fix link to authentication document
Merge pull request #2629 from thommay/fix_auth_link

Fix link to authentication document