create TO notice
1. change field type to number_field
2~3. change field type to date_select
4. edit view bug from TO notice is fixed
1. fix bug to, due_date is not saved
2. numeric validate in backend
3. use bootstrap-selectpicker
add start year option
delete duplicate column (duedate)
Merge pull request #275 from DonutWorks/feature/create-to-notice

create TO notice
removed redundant skip_before_action
refactoring authenticate_controller related, ready for cookie sign_in
cookie login is now available.
cookie test added.
added a migration: account_activations, provider_tokens is merged into users, now users has_many activation_tickets
refactored authentication codes using services,
some models are removed.
migration file (20141012150938_merge_account_activations_and_provider_tokens_into_users.rb) is modified.

all tests are passing
rename activation_tickets to invitations
test: authenticates::activate_user_service
test: authenticates::create_invitation_service
test: authenticates::kakao_sign_in_service