Added NameSilo.com

Added 2-factor authentication information for NameSilo.com, a domain
registrar.
Resized icon, fixed tab error

Resized NameSilo icon to 32x32, fixed the tab characters which were
being inserted by my editor.
Attempt to fix merge conflicts

Updated with latest domains.yml and added namesilo once again.
Another merge of latest before submitting a pull request
Realphabetized
Manual merge. Closes #160

Conflicts:
	_data/domains.yml
Add physical authenticator for #160