Update libcloud.compute.deployment module docstrings.
Also allow user to pass "args" argument to the ScriptFileDeployment class.
Moar love to the deployment classes docstrings.
docs: Add deployment chapter to the documentation.
Fix a typo, some rewording.
docs: Use a better bootstrap example. Previous one wasn't really clear what was
going on and it looked more like a single command was executed on the server
instead of a whole script being run.