Remove reference to apache2_sites_html in README and tests

This variable doesn't appear anywhere else in the codebase so I assume it is
meant to be apache_sites.
updated test
Merge branch 'release/1.0.2'
Remove references to nginx

I suspect this code was copied and these are left overs - there are just the
two mentions of nginx in the task so they must have been missed.
Clarify wording around rules files

Several files are installed automatically to rules and it took me a while to
figure out how they were used - this attempts to clarify that up front.
Merge branch 'Remove-reference-to-nginx' of https://github.com/goetzk/ansible-apache2
Merge branch 'Clarify-readme-rules-section' of https://github.com/goetzk/ansible-apache2 into develop
removed unused option
Merge branch 'release/1.0.3'