Added Sidebar and Video

Added sidebar and video to the overview guide.
Merge pull request #48 from leeolayvar/overview-video

Added Sidebar and Video
Added Koding Apps Guide

Basic Koding Apps overview.

Closes #19
Added Koding App Submission Section

Added a small Koding App submission section, which simply
describes that we're waiting on dev review of that guide.

Soon!
Merge pull request #49 from leeolayvar/kodingapps-guide

Added Koding Apps Guide
Added Link and Guide Description

Not a complete guide.
Group Overview Outline

Added an outline, and some content of the group overview doc.
Shared VM

Added a bit more definition. Still need to tweak it, but with the
limited information available this may be close to complete.

As more information/features are released for groups, we can add
more.
Added the Images

Oops, forgot them in the last pass.
Rewrite much of the Guide

I was very not happy with the previous version, and Andy agreed
with me. So, a rewrite must take place! This is the much improved
rewrite. :)
Merge pull request #50 from leeolayvar/groupsoverview-guide

Koding Groups
Corrected Typo

There was a typo left over from the rewrite. This has been
corrected.
Github Link Guide

A very basic guide about linking your github account.
Merge pull request #54 from leeolayvar/githublink-guide

Github Link Guide
Merge pull request #53 from leeolayvar/groups-correction

Corrected Typo
Update index.md
Added Update WordPress and plugins section
Merge pull request #55 from stefanbc/master

Added update WordPress and plugins section
Added some Missing Sidebars
Fixed a Typo

Closes #57