fix tracklist=0 URL control param, which fixes embedded mode and closes

#132

src/JBrowse/Browser.js

@@ -454,7 +454,41 @@ Browser.prototype.loadConfig = function () {
                 this.onConfigLoaded();
      }));
 };
-Browser.prototype.onConfigLoaded = function() {};
+
+/**
+ * Hook run after the configuration is all loaded.
+ */
+Browser.prototype.onConfigLoaded = function() {
+    // coerce some config keys to boolean
+    dojo.forEach( ['show_tracklist','show_nav','show_overview'], function(v) {
+        this.config[v] = this._coerceBoolean( this.config[v] );
+    },this);
+};
+
+/**
+ * Coerce a value of unknown type to a boolean, treating string 'true'
+ * and 'false' as the values they indicate, and string numbers as
+ * numbers.
+ * @private
+ */
+Browser.prototype._coerceBoolean = function(val) {
+    if( typeof val == 'string' ) {
+        val = val.toLowerCase();
+        if( val == 'true' ) {
+            return true;
+        }
+        else if( val == 'false' )
+            return false;
+        else
+            return parseInt(val);
+    }
+    else if( typeof val == 'boolean' ) {
+        return val;
+    }
+    else {
+        return true;
+    }
+};
 
 /**
  * Add a function to be executed once JBrowse is initialized

src/JBrowse/View/TrackList/Null.js

@@ -1,12 +1,16 @@
+define(['dojo/_base/declare'],function(declare) {
+
+return declare(null,
+
 /**
- * Null track selector.  Does not actually do anything.
- * @class JBrowse.View.TrackList.Null
+ * @lends JBrowse.View.TrackList.Null.prototype
  */
-
-dojo.declare( 'JBrowse.View.TrackList.Null', null, {
+{
     setTracksActive: function() {},
     setTracksInactive: function() {},
     show: function() {},
     hide: function() {},
     toggle: function() {}
-} );
+});
+});
+