setting up DNS
Add new line before code segment

In order to fix misleading bug shown here: http://cl.ly/image/052x461y2E2k
Merge pull request #115 from tomsabin/patch-1

Patch 1
Clearer title for section about the nested element selector.

The previous headings in the selector section all refer to the new
type of selector they introduce (element, class, etc) except for this
one which (I think) refers to the effect the css ‘display’ property has
on positioning elements.

The proper name for this type of selector looks to be the ‘descendant’
selector[1], but I think ‘nested’ is a better word for us here as it
is a term that has already been introduced in lesson 1[2] and is used
later on in this paragraph.

[1] http://www.w3.org/TR/CSS2/selector.html#pattern-matching
[2] https://github.com/codebar/tutorials/blob/24e6c063909296e2faa3e147cc5b3aab83f2b332/html/lesson1/tutorial.md#nesting-elements
added the missing @ in the age variable
Merge pull request #117 from khyamay/gh-pages

added the missing @ in the age variable
Merge pull request #116 from zetter/cz-nested-element-selector

Clearer title for section about the nested element selector.
fix typ in js/lesson3
Merge pull request #118 from heruku/typo-fix

fix typo in js/lesson3
Added missing @ for age and superpower variables
Merge pull request #119 from khyamay/gh-pages

Added missing @ for age and superpower variables