[RSS][Specials] new module and "itsdangerous"

Things added
==========
1. Added RSS module
2. added "itsdangerous" option to Specials module

RSS module
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usage: rss [number of posts to display] <url>
if not defined, only the first 3 (three) posts will be displayed.

Specials
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write "itsdangerous" to get both ~  and  `