Rackspace - Switch to CoreOS for standard cluster

The Rackspace setup for Kubernetes now leverages CoreOS instead of Ubuntu. We've dropped Salt completely for our cluster.
Add Rackspace to build/release.sh

Updates to the build/release.sh scripts to upload build binaries to
Cloud Files.
remove hardcoded cloudfiles path and fix PORTAL_NET
Migrate Rackspace upload scripts to util.sh

The functions to upload built k8s tars to Cloud Files were incorrectly
placed in build/common.sh. These have been migrated to
cluster/rackspace/util.sh
Remove extra newline and update comments in util.sh
Flush data periodically instead of their buffering
Implementing Flush method to httplog
bash completions for kubectl

Support pre command flags:
--api-version=
-a, --auth-path=
--certificate-authority=
--client-certificate=
--client-key=
--insecure-skip-tls-verify=
--match-server-version=
-s, --server=

And commands:
get
describe
create
update
delete

Tries to be smart about things like

kubectl get -o template  requires a template file

It also tries to accept both sigular and plural versions of all
resources.  Even though it will only complete to the plural version.
Replace custom proxy with httputil.ReverseProxy for kubecfg/kubectl.

Fixes #1149 - kubecfg proxy "411 Length Required" error on POST/PUT.
Add Makefile shortcut to release with skip tests
Fix kubectl flags for vagrant
Fix typo in kubectl
add unit tests for rejection of conflicting namespaces
Merge pull request #1931 from derekwaynecarr/fix_kubectl_for_vagrant

Fix kubectl flags for vagrant
Merge pull request #1930 from derekwaynecarr/add_make_command

Add Makefile shortcut to release with skip tests
Merge pull request #1933 from deads2k/dev/deads/add-namespace-unit-tests

add unit tests for rejection of conflicting namespaces
Update the Fedora getting started guide a little
Merge pull request #1932 from derekwaynecarr/fix_typo_kubectl

Fix typo in kubectl
Second attempt at correctly unspecting FLUENTD_GCP
build: switch to golang:1.3 and build go for KUBE_CROSSPLATFORMS