Expand description of .node and resource files.  Fixes #229
fix heading underline in line 71
Fix #226.  Discourage use of the standalone ztps server except for Testing and Demonstrations
Update Apache conf recommendation

- Show virtualhost directive
- suggest /etc/httpd/conf.d/ztpserver.conf location
- Inlcude WSGISocketPrefic required for RHEL
- Include both Apache 2.2 Order, Allow AND the Apache 2.4 Require all
  granted syntax
- Fix #231