Fix two bugs found by @TiuTalk

* When redirecting internal links, double-check that they actually
  are internal before doing so.
* Avoid double-adding items to the /browse mod list

src/coffee/controllers/base_controller.coffee

@@ -63,6 +63,9 @@ module.exports = class BaseController extends Backbone.View
         href = $(event.target).attr 'href'
         href ?= $(event.currentTarget).attr 'href'
         logger.info "Re-routing link to internal navigation: #{href}"
+        if href? and href.match /^http/
+            window.location.href = href
+
         router.navigate href, trigger:true
 
     show: (args...)->