[CS2] 2.0.0-beta1 (#4499)

* Fix browser build to incorporate Markdown-It, not Marked

* Update Google Closure Compiler; recompile browser build but with MINIFY=false, because Closure Compiler throws an error on our current code; see google/closure-compiler-js#59

* Bump version to 2.0.0-beta1; do release build, with updated docs and annotated source

Author: GeoffreyBooth

Cakefile

@@ -122,7 +122,7 @@ task 'build:browser', 'build the merged script for inclusion in the browser', ->
     return #{fs.readFileSync "./package.json"};
   })();
   """
-  for {name, src} in [{name: 'marked', src: 'lib/marked.js'}]
+  for {name, src} in [{name: 'markdown-it', src: 'dist/markdown-it.min.js'}]
     code += """
       require['#{name}'] = (function() {
         var exports = {}, module = {exports: exports};

docs/v2/annotated-source/grammar.html

@@ -996,6 +996,7 @@ <h2 id="grammatical-rules">Grammatical Rules</h2>
     o <span class="hljs-string">'Identifier AS Identifier'</span>,               <span class="hljs-function">-&gt;</span> <span class="hljs-keyword">new</span> ExportSpecifier $<span class="hljs-number">1</span>, $<span class="hljs-number">3</span>
     o <span class="hljs-string">'Identifier AS DEFAULT'</span>,                  <span class="hljs-function">-&gt;</span> <span class="hljs-keyword">new</span> ExportSpecifier $<span class="hljs-number">1</span>, <span class="hljs-keyword">new</span> Literal $<span class="hljs-number">3</span>
     o <span class="hljs-string">'DEFAULT'</span>,                                <span class="hljs-function">-&gt;</span> <span class="hljs-keyword">new</span> ExportSpecifier <span class="hljs-keyword">new</span> Literal $<span class="hljs-number">1</span>
+    o <span class="hljs-string">'DEFAULT AS Identifier'</span>,                  <span class="hljs-function">-&gt;</span> <span class="hljs-keyword">new</span> ExportSpecifier <span class="hljs-keyword">new</span> Literal($<span class="hljs-number">1</span>), $<span class="hljs-number">3</span>
   ]</pre></div></div>
 
         </li>