from pull-request 1501

* refs/heads/feature/mailbox:
  Mailbox: Ignore emails from a person who is not a Yobi user

Reviewed-by: 채수원 

from pull-request 1491

* refs/heads/fix/bfcache-bug:
  fix: Workaround for pjax bug result from bfcache

Reviewed-by: null 
Reviewed-by: null 

from pull-request 1482

* refs/heads/issue-2130:
  Added notification event after the pulll-request's commits are changed

Reviewed-by: 채수원 

from pull-request 1497

* refs/heads/feature/mailbox:
  Mailbox: Ignore auto-replied emails from Naver mail

Reviewed-by: 채수원 

An email from the Naver Email Service seems to contain "X-Naver-Absent"
header whose value is "Yes" when it is an auto-replied email.

from pull-request 1480

* refs/heads/issue-2055:
  adds a feature about recipients limitation per a email when sending notification emails.

Reviewed-by: null 
Reviewed-by: 이응준 

from pull-request 1499

* refs/heads/docs/readme-copyright:
  README: Update copyright; 2014 -> 2015

Reviewed-by: 채수원 

from pull-request 1488

* refs/heads/issue-2147:
  AttachmentCache: Suppressing unchceck warning

Reviewed-by: null 

from pull-request 1490

* refs/heads/feature/mailbox:
  mailbox: Do not post a reply to event as an issue

Reviewed-by: 채수원 

from pull-request 1487

* refs/heads/issue-2149:
  Revert "Merge branch 'issue-2098' of dlab/hive"

Reviewed-by: 채수원 

This patch prevents using pjax when a user use firefox or safari
see more https://developer.mozilla.org/en-US/docs/Using_Firefox_1.5_caching

A reply to event might be posted as an issue if the reply does not have
neither In-Reply-To nor References header.

This reverts commit b4eec9f, reversing
changes made to ce5115a.

from pull-request 1485

* refs/heads/hotfix/voter-bug:
  hotfix: fix voter bug

Reviewed-by: 채수원 

This patch fix the bug some user can't see issues
whose have more than 4 voters.
We will find the reason later.

from pull-request 1484

* refs/heads/issue-2135:
  code: Removed unnecessary indentation

Reviewed-by: 채수원 

from pull-request 1483

* refs/heads/hotfix/markdown-preview:
  hotfix: revoke markdown preview at comments

Reviewed-by: null 

* Issue
    - Altough some smtp server has recipients limitation per a email, Yobi sends notification emails regardless of it.

* Solution
    - `application.notification.bymail.recipientLimit` is added to `application.conf.default`. If it is set, notification emails are split along the value.
    - Codes which split the notification emails are added.

Private-issue: 2055

Some code snippet related to markdown preview was removed by mistake.
This fix revoke it.