update gemfile for deployment
update gemfile for deployment

sanger/asset_audits,JamesGlover/asset_audits,emrojo/asset_audits,sanger/asset_audits,JamesGlover/asset_audits,JamesGlover/asset_audits,emrojo/asset_audits,JamesGlover/asset_audits,emrojo/asset_audits,emrojo/asset_audits,sanger/asset_audits,sanger/asset_audits