Add specs for showing lfs object in UI.

app/controllers/projects/raw_controller.rb

app/helpers/blob_helper.rb

app/helpers/tree_helper.rb

app/models/lfs_object.rb

app/views/projects/blob/_actions.html.haml

app/views/projects/blob/_blob.html.haml

app/views/projects/blob/_download.html.haml

app/views/projects/blob/show.html.haml

app/views/projects/diffs/_file.html.haml

features/project/source/browse_files.feature

features/steps/project/source/browse_files.rb

spec/controllers/projects/raw_controller_spec.rb

spec/support/test_env.rb