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.
Merge branch 'develop' into msabramo_develop
configure.py: Make messaging not quite so specific to Amazon EC2

pem keys for example are not specific to Amazon. I am using one to
connect to an OpenStack VM for example.
configure.py: Prompt for user but default to "ec2-user"
src/example_01/access_machine.py: generalize so we can use a remote_user
other than "ec2-user" by reading it from ansible.cfg
README.md: Update output of configure.py

to show that it's less AWS-specific now.
Merge branch 'generalize_so_not_quite_so_specific_to_ec2' into msabramo_develop

Conflicts:
	README.md
	src/configure.py