Fixed Directory Permissions for Apache 2.4

Apache 2.4 directory permissions no longer support 'Allow from all'.
Instead they use the 'Require all granted' syntax.  I have added in
a check for apache 2.4 in the directory that makes this change.
Merge branch 'better_apache24_support' of https://github.com/elliott-davis/ssl_certificate-cookbook into better_apache24_support