Added routing to Organization::contact with POST.
Added contact action for Organization controller
Added Email class and Email::send_contact action.
Renamed email.rb -> organization_contact_mailer.rb, and made some nifty fix
Renamed. Due to class name modification, and method name modification.
  app/views/email/send_contact.text.haml
  to
  app/views/organization_contact_mailer/contact_mail.text.erb
Modified class name and method name.
Also removed some unused instance var for debug use.
Removed some meaningless comments.
Renamed and made some fix.
  spec/mailers/email_spec.rb
  to
  spec/mailers/organization_contact_mailer_spec.rb
Changed error handling in OrganizationController.
Checking if subject and body is not nil now.
Added line feed for long line.
Added contents check for contact mail.
Changed the format from haml to erb.
Removed debug code and fixed a bug
Fix some bugs.
Moved mailing function to the User model.
Added letter_opener for use in development.
Fixed exception handling flow.
Removed unnecessary exclamation mark, and replaced let to subject.
Merge pull request #58 from root04/xengineer/contact_organization_form

Xengineer/contact organization form
Add dotenv
Install paperclip