UI and API improvements for working with large repositories

- Change the tag check bar to only select the current page (by default), but allow for selecting ALL tags
- Limit the number of tags compared in the visualization view to 10
- Fix the multiselect dropdown to limit itself to 10 items selected
- Remove saving the selected tags in the URL, as it is too slow and overloads the URLs in Chrome when there are 1000+ tags selected
- Change the images API to not return locations: By skipping the extra join and looping, it made the /images API call 10x faster (in hand tests)

Fixes #292
Fixes #293

static/js/pages/repo-view.js

@@ -36,19 +36,6 @@
     // Make sure we track the current user.
     UserService.updateUserIn($scope);
 
-    // Watch the selected tags and update the URL accordingly.
-    $scope.$watch('viewScope.selectedTags', function(selectedTags) {
-      if (!selectedTags || !$scope.viewScope.repository) { return; }
-
-      var tags = filterTags(selectedTags);
-      if (!tags.length) {
-        $location.search('tag', null);
-        return;
-      }
-
-      $location.search('tag', tags.join(','));
-    }, true);
-
     // Watch the repository to filter any tags removed.
     $scope.$watch('viewScope.repository', function(repository) {
       if (!repository) { return; }