Removed name column from users
Fix for anonymous user
Can search by tags

Different colors for reply/post in posts show view
	modified:   BackchannelApp/app/models/post.rb
	modified:   BackchannelApp/app/views/posts/_form.html.erb
	modified:   BackchannelApp/app/views/posts/index.html.erb
	modified:   BackchannelApp/app/views/replies/_form.html.erb
	modified:   BackchannelApp/db/schema.rb