Renamed integration spec
Add integration tests for deploy task

This commit adds the outlines of a testing framework for Cap tasks.
Currently just the `cap install` and `cap deploy` tasks are covered. For
now, these tests can only be run if it is `ssh localhost` will work for
you and are currently excluded from the suite. It is my intention to
eventually replace the `sshkit` backend with a test backend, but for now
this is good enough to prevent simple regressions.