Update to Nagios 3.4.4 for source installs
Add the ability to install nrpe/plugins from packages on rhel/fedora

Installs from EPEL which adds yum as a requirement.  On Fedora >17 it
does not require epel.  There's a new attribute for packages since the
rhel packages break out every plugin into a package.
[COOK-2450] Add ability to define service groups through data bags.
Merge pull request #128 from tas50/COOK-2473

COOK-2473: Update to Nagios 3.4.4 for source installs
Describe to new behavior in the README
Add hostname normalization to lowercase.
nrpe config files should not be world readable as they can contain sensitive info like passwords, keys, etc.
Merge pull request #134 from tas50/COOK-1068

Cook 1068: Allow the installation of NRPE using EPEL packages on RHEL / Fedora
Correct the IP check logic to check the right node

I had it checking the Nagios server's attributes before when I wanted
the search discovered node
Don't fail to write out services in the hostgroups databags

Fix the logic for checking for valid host groups
[COOK-2565] Update nginx.conf.erb for correct use AUTH
Merge pull request #140 from tas50/COOK-2257

COOK-2257: Correct the IP check logic to check the right node
[COOK-2474] don't assume node has cloud attributes

Prior to this the cookbook assumed if the server node had a cloud
attributes, every node had the cloud attributes, this removes this
assumption.
Merge branch 'COOK-2474'
Merge pull request #141 from tas50/COOK-2558

COOK-2558: Don't fail to write out services in the hostgroups databags
Merge pull request #139 from scottso/fix_config_perms

[COOK-2546] nrpe config files should not be world readable
Merge pull request #143 from pioneerit/COOK-2565

[COOK-2565] Update nginx.conf.erb for correct use AUTH
[COOK-2546] - use nagios user/group attribute
Removed extra "!("
Fix syntax if nagios_hostgroups data bag based search returns nothing

Don't write out "members empty" if nothing comes back from the search.
Instead write out a host group with nothing, which is actually correct.
 Also remove an empty line so that there is a single empty line between
each host group definition.