Remove io.js and nw.js

Fixes #47

Author: John Haley

_sass/_layout.scss

@@ -361,7 +361,7 @@ header {
 
   .column {
     text-align:center;
-    padding:0 $spacing-unit/2;
+    padding:0 (((2 * $spacing-unit)/3) + 3);
   }
 
   h3 {

guides/index.md

@@ -12,7 +12,6 @@ description: Learning NodeGit
 - [Basics](install/)
 - [From source](install/from-source)
 - [Electron](install/electron/)
-- [NW.js](install/nw.js/)
 
 ***
 

guides/install/nw.js/index.md

@@ -30,14 +30,6 @@ npm install nodegit
         Electron
         </a>
       </div>
-      <div class="column">
-        <a href="http://nwjs.io">
-          <img src="/img/nwjs.png"/>
-        </a>
-        <a href="/guides/install/nw.js/">
-        nw.js
-        </a>
-      </div>
     </div>
   </div>
   <div class="column">
@@ -68,11 +60,6 @@ npm install nodegit
           <img src="/img/nodejs.png"/> NodeJS
         </a>
       </div>
-      <div class="column">
-        <a href="https://iojs.org">
-          <img src="/img/iojs.png"/> io.js
-        </a>
-      </div>
     </div>
   </div>
 </div>