Merge branch 'use-specinfra-runner' into 2.0
Bump up version
Use rspec-its
Update dependency to use RSpec 3 and rspec-its
Bump up version
Update subproject
Change be_true to be_truthy and be_false to be_falsey
add ubuntu ppa support

Conflicts:
	Rakefile
Update dependency on rspec
Override failure message in the manner of RSpec 3
Merge pull request #416 from serverspec/override-failure-message

Override failure message
Bump up version
Refactor setup.rb
Merge pull request #421 from serverspec/refactor-setup.rb

Refactor setup.rb
Remove the gems that everyone doesn't need
Update subproject
Define rspec task if RSpec is defined
Fix matching condition of vagrant vms
Remoeve dependency on net-ssh
Upadte setup.rb following the change of Specinfra

Now you don't need to call Net::SSH.start by yourself.
Only you have to do is set ssh_options.