Fixes minor typos in the GCE guide, one of which causes a code block to fail to render.
Fixes #5059 Ignore lookup failures when templating a task name
Convert gather_facts to a boolean value if it is not None

Fixes #5618
Merge pull request #6699 from clconway/devel

Fixes minor typos in the GCE guide, one of which causes a code block to ...
Fixes #6705 Give each role a unique uuid and apply tags only to tasks matching the uuid
Fixed template validation docs and example.
Merge pull request #6706 from geerlingguy/devel

Fix template validation docs and example.
Support arbitrary extra args in rax module

Add extra_create_args and extra_client_args to rax module to support passing
advanced configuration options to client instantiation and server create calls.