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.
src/example_02/auto_update_machine.py: generalize so we can use a remote_user
other than "ec2-user" by reading it from ansible.cfg
src/example_03/README.txt: Minor tweaks
README.md: Fix numbering with interspersed code blocks
README.md: Fix numbering of steps to be 1-based

to match how GitHub renders it, to minimize confusion.
Merge branch 'generalize_so_not_quite_so_specific_to_ec2' into msabramo_develop
Merge branch 'example_03_README.txt' into msabramo_develop
README.md: Put host before options in ansible command

for consistency with following example and ansible docs
Merge branch 'README_tweaks' into msabramo_develop

Conflicts:
	README.md