Organized Classes, Dogecoin Video tweak, Container Colors, and other tiny changes.

This Pull Request has many changes. This pull request modifies the following:

**Markup**
* Replaces the hard-coded style attributes in the HTML index document with CSS Classes.
* Removed extra period typo in meta description.
* Double slash URLs for CDNs without them.
* See how the What is Dogecoin video on http://dogecoin.com/ moves the website slightly when you click the button? This fixes it.

**Design**
* Removes bold on "DOGECOIN" title in header, made font size bigger to accommodate for it. This is so it isn't "pixelly" on computer displays.
* More saturated info container colors.
* Removed top-border on bottom bar in header.
* Centered Dogecoin logo in header a bit.
* Adds some padding to circle buttons when on mobile. [Before](http://puu.sh/9BaVb/44b1a6e28f.png) and [After](http://puu.sh/9BaSC/7bcadeaf45.png).
* Capitalized credits on bottom of page (the lowercase letters doesn't fit the rest of the website!).

Preview: http://i.imgur.com/g5cZv6e.png
After pressing YouTube video (notice the header container not moving?): http://i.imgur.com/rwU9urk.png