example_01/access_machine.py: Improve messaging a bit.
configure.py: Use os.path.expanduser

so that stuff like:

   ~/.ssh/devops.pem

works.
Merge pull request #43 from msabramo/configure.py_expanduser

configure.py: Use os.path.expanduser
Merge pull request #45 from msabramo/example_01_improve_messaging

example_01/access_machine.py: Improve messaging a bit.
README.md: ansible_host => ansible_hosts
README.md: coonfigure.py => configure.py
README.md: Minor formatting tweaks
README.md: Slight tweak on how to run configure.py
README.md: More tweaks
README.md: Put parentheses around commands

so they execute in subshell and user doesn't change directory in their
shell. This allows them to flow better in sequence.