Make directories to collect server and service configuration.

- /etc/nagios/servers
- /etc/nagios/services
Merge branch 'id/87' into dev
Enable sansakizaka.com monitoring (blog and server).

This commit fixes #77 and #79.
Merge branch 'id/79' into dev
Divide localhost's host settings and service settings.

This commit refs #87.
Divide sansakizaka's server settings and service settings.

This commit fixes #87.
Merge branch 'id/87' into dev
Divide and put the hostgroup configuration to /etc/nagios/hostgroups.

Add the configuration for Nagios to read /etc/nagios/hostgroups/*.cfg,
and put the hostgroup configuration there.
Merge branch 'id/88' into dev
Enable sakura-vps#01 monitoring.

This commit fixes #86.
Merge branch 'id/86' into dev
Enable sakura-vps#01 SSH monitoring.

This commit fixes #89.
Merge branch 'id/89' into dev
Enable blog.kazu634.com monitoring.

This commit fixes #71.
Merge branch 'id/71' into dev
Merge branch 'dev'