Create backbone models/views for assets.

cleanup

Updates.

Testing changes.

Testing changes.

asset-index progress state cleanjup.

cleanup

cms/envs/common.py

@@ -254,8 +254,10 @@ PIPELINE_JS = {
              'js/models/metadata_model.js', 'js/views/metadata_editor_view.js',
              'js/models/uploads.js', 'js/views/uploads.js',
              'js/models/textbook.js', 'js/views/textbook.js',
-             'js/views/assets.js', 'js/src/utility.js',
-             'js/models/settings/course_grading_policy.js'],
+             'js/src/utility.js',
+             'js/models/settings/course_grading_policy.js',
+             'js/models/asset.js', 'js/models/assets.js',
+             'js/views/assets_view.js', 'js/views/asset_view.js'],
         'output_filename': 'js/cms-application.js',
         'test_order': 0
     },