Fixed typo in zen.scss and corresponding views

app/assets/stylesheets/framework/zen.scss

@@ -32,7 +32,7 @@
   }
 }
 
-.zen-cotrol {
+.zen-control {
   padding: 0;
   color: #555;
   background: none;

app/views/projects/_md_preview.html.haml

@@ -8,7 +8,7 @@
         %a.js-md-preview-button{ href: "#md-preview-holder", tabindex: -1 }
           Preview
       %li.pull-right
-        %button.zen-cotrol.zen-control-full.js-zen-enter{ type: 'button', tabindex: -1 }
+        %button.zen-control.zen-control-full.js-zen-enter{ type: 'button', tabindex: -1 }
           Go full screen
 
   .md-write-holder

app/views/projects/_zen.html.haml

@@ -4,5 +4,5 @@
     = f.text_area attr, class: classes, placeholder: placeholder
   - else
     = text_area_tag attr, nil, class: classes, placeholder: placeholder
-  %a.zen-cotrol.zen-control-leave.js-zen-leave{ href: "#" }
+  %a.zen-control.zen-control-leave.js-zen-leave{ href: "#" }
     = icon('compress')