Include symbols from oli.js using interface and implements tags

Instead of regex parsing, we define tags for interface and
implements.

apidoc/plugins/interface.js

@@ -0,0 +1,23 @@
+var util = require('util');
+exports.defineTags = function(dictionary) {
+
+  var classTag = dictionary.lookUp('class');
+  dictionary.defineTag('interface', {
+    mustHaveValue: false,
+    onTagged: function(doclet, tag) {
+      classTag.onTagged.apply(this, arguments);
+      doclet.interface = true;
+    }
+  });
+
+  dictionary.defineTag('implements', {
+    mustHaveValue: true,
+    onTagged: function(doclet, tag) {
+      if (!doclet.implements) {
+        doclet.implements = [];
+      }
+      doclet.implements.push(tag.value.match(/^{(.*)}$/)[1]);
+    }
+  });
+
+};