Add GPLv2 license file
Update files for Travis CI
Fixed array expansion for whitelist.

t_whitelist is an array, so when the length is 1, the zero-th element
must be referenced.  Otherwise, ruby will expand the array as a string,
which will not result in a syntax which nrpe can understand.
Fixed erb file to correctly call custom functions.

This fixes the following error message in Puppet 3.1:

Error: Could not retrieve catalog from remote server: Error 400 on SERVER: Failed to parse template puppet-icinga/common/etc/icinga/htpasswd.users.erb:
  Filepath: /opt/puppet/lib/ruby/site_ruby/1.9.1/puppet/parser/functions.rb
  Line: 149
  Detail: custom functions must be called with a single array that contains the arguments. For example, function_example([1]) instead of function_example(1) at /etc/puppetlabs/puppet/environments/production/modules/puppet-icinga/manifests/master.pp:47 on node your_node_name_here
  Warning: Not using cache on failed catalog
  Error: Could not retrieve catalog; skipping run
Use full path names when calling commands.

This fixes this error in Puppet 3.1:

Error: Failed to apply catalog: Parameter unless failed on Exec[external-commands]: 'dpkg-statoverride --list nagios nagios 751 /var/lib/icinga && dpkg-statoverride --list nagios www-data 2710 /var/lib/icinga/rw' is not qualified and no path was specified. Please qualify the command or specify a path. at /etc/puppetlabs/puppet/environments/production/modules
Wrapped exception:
'dpkg-statoverride --list nagios nagios 751 /var/lib/icinga && dpkg-statoverride --list nagios www-data 2710 /var/lib/icinga/rw' is not qualified and no path was specified. Please qualify the command or specify a path.

And this error too:

Error: Failed to apply catalog: Validation of Exec[fix-permissions]
failed: 'chmod -R go+r /etc/icinga/objects' is not qualified and no path was specified. Please qualify the command or specify a path. at /etc/puppetlabs/puppet/environments/production/modules/puppet-icinga/manifests/master.pp:18
Wrapped exception:
'chmod -R go+r /etc/icinga/objects' is not qualified and no path was specified. Please qualify the command or specify a path.