apache README grammar corrections
apache README grammar fix

changed system to environment
apache config README update

Replace instances of gitlab.conf with gitlab-ssl.conf.  The docs
should be more consistent on what it recommends.
Merge pull request #132 from sag47/docs-apache_grammar

apache README grammar corrections
Added myself to contributors
Simplified firewall configuration
lokkit edits iptables, ip6tables and system-config-firewall in /etc/sysconfig and is available in a minimal CentOS installation.
Merge pull request #134 from yorn/firewall

[CentOS] Simpler firewall instructions