add a link to the raw paste from the pretty paste

fixes wantguns/bin#22

static/js/pretty.js

@@ -31,3 +31,7 @@ function forkClicked() {
 function newPasteClicked() {
     window.location = homePage;
 }
+
+function rawClicked() {
+    window.location = window.location.href.replace('/p/', '/');
+}

templates/pretty.html.tera

@@ -26,6 +26,7 @@
     </div>
     <div class="topRightBox"> 
         <button id="wrapBtn" onclick="wrapClicked()">&#9166; Wrap</button>
+        <button id="rawBtn" onclick="rawClicked()">= Raw</button>
         <button id="forkBtn" onclick="forkClicked()">&#x2442; Fork</button>
         <button id="newPasteBtn" onclick="newPasteClicked()">&#43; New</button>
     </div>