add gitattributes file to maintain line endings for .sh files
add gitattributes file to maintain line endings for .sh files

fix #47

michaelbeil/puppet-nodejs,willdurand/puppet-nodejs,jeff1evesque/puppet-nodejs,michaelbeil/puppet-nodejs,jeff1evesque/puppet-nodejs,maneeshmp/puppet-nodejs,maneeshmp/puppet-nodejs,Bauer-Xcel-Media/puppet-nodejs,willdurand/puppet-nodejs,Bauer-Xcel-Media/puppet-nodejs