Removed conference_date_string_helper, moved date_string to application_controller

Deleted home_helper.rb
Merge pull request #303 from gopesht/modify_date_helper

Removed conference_date_string_helper, moved date_string helper to application_controller
Adds email template and settings for conference dates updates
Conference date update email notification completed

Added tests
Adds migration for Conference Registration Dates to Email Settings
Adds email template and settings for conference registration dates updates

Added tests