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.
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.
README.md: Put host before options in ansible command

for consistency with following example and ansible docs
README.md: Tweak #5 to mention -vvv
README.md: Suggest doing yum update ad-hoc with -vvv

Easier to see that it's actually doing something
Merge pull request #42 from msabramo/README_tweaks

README.md tweaks