Add a Centos 6 specific recipe
user
```ruby
#
# Cookbook Name:: osl_application_python_test
# Recipe:: _centos
#
# Copyright 2015, Oregon State University
#
# Licensed under the Apache License, Version 2.0 (the 'License');
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
#
#     http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an 'AS IS' BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.

if node['platform_version'] == '6.6'
  include_recipe 'yum-ius'
  include_recipe 'yum-epel'

  %w(gcc python27 python27-devel python27-pip).each do |pkg|
    package pkg
  end
end
```
assistant