try fix Gemfile for rails 4
try fix Gemfile for rails 4

glebm/rails_email_preview,bandzoogle/rails_email_preview,bandzoogle/rails_email_preview,0xCCD/rails_email_preview,fgbreel/rails_email_preview,0xCCD/rails_email_preview,bandzoogle/rails_email_preview,glebm/rails_email_preview,fgbreel/rails_email_preview,fgbreel/rails_email_preview,glebm/rails_email_preview