Merge pull request #3 from tgerla/master

add YAML header to most top level playbooks, minor adjustments to indent...
Fixes #6
Fixes #4
Fixes #2.
Shows registered variables, set_facts, and group_by.
Using ignore_errors, updating docs.
Update README.md
Refactor of vagrantfile
Update apache_ver.yml
change ssh key to training.
disable host key checking
Handlers demo.
Better variables example.
Adding proper role.
tagging include vars stuff.
Adding register, set_fact, group_by stuff.
Adding handler examples.
Updating docs.
Showing simple handler.