Check epel is installed before yum to save time.
Add dependencies meta info to erlang role.
Add dependencies to fcgiwrap role.
Add dependencies to td-agent role.
Add dependencies to jenkins role.
Add dependencies to xbuild role.
Add dependencies to monit role.
Add dependencies to nginx role.
Rename xbuild/* roles to xbuild-*.
Add dependencies to xbuild-* roles.
Add dependencies to xbuild-php/php-fpm role.
Add dependencies to nagios/core role.
Add dependencies to mysql/* roles and refactor roles.
Rename nagios/core role to nagios and add dependencies.
Add timezone to dependencies of xbuild-php role.
Add dependencies to ganglia/* roles and add ganglia role.
Rename ganglia/web role to ganglia.
Refactor mysql/* role. Normally use mysql and mysql/client.
Refactor lxc role.