Add gh-pages dummy job

The doc updater needs the r/w SSH key too

Add it to the container to ensure we DTRT.

Merge pull request #14 from conormcd/circleci-2.0

Revive the tests

Merge branch 'dry-test-session-handling'

Merge branch 'consolidate-timeouts'

Merge branch 'libssh2-1.7.0'

Merge branch 'junit-xml-test-results'

Merge branch 'read-timeouts'

Macro hygiene.

Most of these changes are just paranoia (or "belt and braces" if you
want to be more charitable) but it makes sense to be a bit careful.

Merge pull request #12 from conormcd/logging

Add logging