Add unit tests for example syntax

Tests api/examples, examples, and any embedded json in readme.
Merge pull request #590 from smarterclayton/test_example_syntax

Add unit tests for example syntax
query minion's /healthz for sanity checking. Removing gcutil ssh to
VM, and check kubelet's status.
update github.com/fsouza/go-dockerclient
Merge pull request #589 from monnand/update-docker-client

update github.com/fsouza/go-dockerclient
Merge pull request #593 from dchen1107/cleanup

Query minion's /healthz for sanity checking.