Compress source for permalink

Use lz-string (http://pieroxy.net/blog/pages/lz-string/index.html) to
compress source code for permalink usage.

static/compiler.js

@@ -219,7 +219,7 @@ function Compiler(domRoot, origFilters, windowLocalPrefix, onChangeCallback) {
 
     function serialiseState() {
         var state = {
-            source: cppEditor.getValue(),
+            sourcez: LZString.compressToBase64(cppEditor.getValue()),
             compiler: domRoot.find('.compiler').val(),
             options: domRoot.find('.compiler_options').val(),
         };
@@ -227,7 +227,11 @@ function Compiler(domRoot, origFilters, windowLocalPrefix, onChangeCallback) {
     }
 
     function deserialiseState(state) {
-        cppEditor.setValue(state.source);
+        if (state.hasOwnProperty('sourcez')) {
+            cppEditor.setValue(LZString.decompressFromBase64(state.sourcez));
+        } else {
+            cppEditor.setValue(state.source);
+        }
         domRoot.find('.compiler').val(state.compiler);
         domRoot.find('.compiler_options').val(state.options);
         // Somewhat hackily persist compiler into local storage else when the ajax response comes in

static/index.html

@@ -13,6 +13,7 @@
         <script src="compiler.js"></script>
         <script src="gcc.js"></script>
         <script src="ext/bootstrap/js/bootstrap.js"></script>
+        <script src="ext/lz-string/lz-string-1.3.3-min.js"></script>
 <script type="text/javascript">
   var _gaq = _gaq || [];
   _gaq.push(['_setAccount', 'UA-55180-6']);