require newrelic plugin
delete require in Gemfile
Revert "delete require in Gemfile"

This reverts commit a82567264fdd4dc998c92bc442bfb6f5dc896278.
Revert "require newrelic plugin"

This reverts commit f2edb01aa185cbdd3bd20795cc412d67cf58db2f.
Merge branch 'master' into release
Merge branch 'master' into release
Merge branch 'master' into release
merge from heroku:master
Merge branch 'master' into work
delete unnecessary files
layout.slim as a template
Merge branch 'work'