Implements OPTIONS http verb for root path
close #294
Merge pull request #296 from ChrisBr/implements_options_for_root

Implements OPTIONS http verb for root path
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
Remove therubyracer because of the following reasons:

* therubyracer is unstable between platforms, platform versions, ruby interpreters and even ruby versons.
  Pretty much everytime there's native extension compilation issue, it is therubyracer.
* therubyracer is officially discouraged by heroku as it uses lot of memory. On the other hand node.js advertises itself as very lightweight.
* using therubyracer on server is just like installing Node that can be used only by ruby apps (you're using v8 anyway)
* btw. node.js is necessary only on Windows and Ubuntu development, on Mac development ExecJS is using JavaScriptCore.

catched from https://github.com/sheerun/rails4-bootstrap/issues/18
Unused route for Conference#show
add volunteer fields to user
Merge pull request #310 from gopesht/unused_route

Unused route for Conference#show
fix attachment_default migration
Merge pull request #314 from differentreality/attachment_default

fix attachment_default migration
Merge pull request #312 from differentreality/user_fields_volunteers

Add volunteer fields to user
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

Minor typo
Added test for email notification on conference dates and registration dates updates
Merge pull request #298 from gopesht/notify_on_date_change

Notify on date change
Update schema, fixes #320
Merge pull request #307 from openSUSE/review_140712_remove_therubyracer

Remove therubyracer because of the following reasons:
Merge pull request #322 from openSUSE/review_140716_update_schema

Update schema, fixes #320