readable_html doesn't properly escape text strings

[vkryukov]

For example, the following excerpt from test case 001

"<blockquote><p>Drinking game for web devs:<br/>(1) Think of a noun<br/>(2) Google &quot;&lt;noun&gt;.js&quot;<br/>(3) If a library with that name exists - drink</p>— Shay Friedman (@ironshay) <a href=\"https://twitter.com/ironshay/statuses/370525864523743232\">August 22, 2013</a></blockquote>" 
|> Readability.article 
|> Readability.readable_html

returns

"<div><div><p>Drinking game for web devs:<br/>(1) Think of a noun<br/>(2) Google \"<noun>.js\"<br/>(3) If a library with that name exists - drink</p>— Shay Friedman (@ironshay) <a href=\"https://twitter.com/ironshay/statuses/370525864523743232\">August 22, 2013</a></div></div>"

Notice the angle brackets around noun and not HTML escaped.

This also causes a problem with HTML code fragment down on the page.

[vkryukov]

I suspect that this commit to make tests pass should be reverted: bbe8f6a.

If you think about it, you do want encoding of special symbols, otherwise you can get an html with a different meaning.