Enhance read-more modal

## 概要
Quiche 上での read-more を読みやすくするPRです

#### 変更点
- headings
- img
- a

## スクショ
![](http://gyazo.l0o0l.co/img/2014-06-11/8fa4aacf9eeec34ee3adbe4e909dbe7c.png)
![](http://gyazo.l0o0l.co/img/2014-06-11/b148a2bbeb019e143ed7252113a844e6.png)
Surrounding space missing for operator '+'.<br>Space missing to the left of {.<br>Space between { and | missing.<br>Space missing inside }.