Skip adding skype smile & emojis for <pre> & <code> text

![screenshot from 2014-01-19 17 13 46](https://f.cloud.github.com/assets/1506905/1949729/240e4c94-811d-11e3-8d6f-81274a245aa5.png)
+ preventing smiles from being added in `<pre>` & `<code>` text 
+ adding filterUtils modules: logify, splitting into lines, breaked by tags etc.