Set transport option user_known_hosts_file to /dev/null

If we redeploy vcsa appliance it will refuse ssh connection. In this
case we no longer want to store the user known hosts file.
Merge pull request #10 from nanliu/known_host

Set transport option user_known_hosts_file to /dev/null
Add support files.
Add unit tests for providers.
Cleanup manifests.
Add travis testing support.

Conflicts:
	.fixtures.yml
	.gitignore
	Gemfile
	spec/spec_helper.rb
Add known issues to readme.

[ci skip]
Merge pull request #11 from nanliu/upgrade

Update module for Puppet 3.
Merge pull request #13 from vmware/development

Update master with Puppet 3 changes