Add the resource version to api.*List items from etcd

Allows clients to watch more easily (can invoke Get, then
Watch).
Describe some ecosystem projects around Kube
Remove workaround for salt-minion startup in vagrant/provision-minion.sh

The workaround was not needed, as salt-minion was always correctly
started in the Vagrant minion setup.

The issue reported in #270 was clearly specific do System V style init
scripts and will not affect systemd.

Also remove the inaccurate comment from provision-master.sh, since -X
was not even really in use there.

Tested:
- Performed 3 full `vagrant up` and `vagrant destroy -f` cycles with at
  least 3 minions and up to 6 minions in one case. Checked that
  salt-minion was up in each of the minions using a `systemctl status
  salt-minion` command.
- Started nginx on the cluster using cluster/kubecfg.sh, confirmed it
  was up with `list /pods` and confirmed it was reachable using wget on
  port 8080 of the minions.

Signed-off-by: Filipe Brandenburger <filbranden@google.com>
Merge pull request #1113 from filbranden/vagrant_salt_master3

Remove workaround for salt-minion startup in vagrant/provision-minion.sh
Invert api and api/v1beta1 dependencies

This is some cleanup that has been needed for a while.
There's still one more step that could usefully be done, which is to
split up our api package into the part that provides the helper
functions and the part that provides the internal types. That can come
later.

The v1beta1 package is now a good example of what an api plugin should
do to version its types.
Merge pull request #1099 from smarterclayton/return_resource_version_on_list

Add the resource version to api.*List items from etcd
Merge pull request #1106 from smarterclayton/describe_ecosystem_projects

Describe some ecosystem projects around Kube
Rename `output/` directory to `_output/`

go build ./... will ignore any directory starting with an underscore.
Remove dead code now that we are using godep.
Only build pause.go under linux.

This makes `godep go build ./...` work.
Merge pull request #1119 from jbeda/rename_output

Make `godep go build ./...` work
Merge pull request #1117 from lavalamp/fixApi

Invert api and api/v1beta1 dependencies
Improve test script

add usage
verify flag value for -i is numeric
allow multiple targets on the command line
actually capture coverage output
fix lingering GOFLAGS undef issue
fix issue with -i not working at all: ((x++)) returns 1 when x is 0, which is
  incompatible with "set -e"