Add Exponent logo to nux menu, adjust for smaller screens
Add Exponent logo to nux menu, adjust for smaller screens

fbshipit-source-id: 758c54f

exponent/exponent,exponentjs/exponent,jolicloud/exponent,exponentjs/exponent,exponent/exponent,jolicloud/exponent,exponentjs/exponent,exponent/exponent,exponentjs/exponent,jolicloud/exponent,exponent/exponent,jolicloud/exponent,jolicloud/exponent,jolicloud/exponent,exponent/exponent,exponentjs/exponent,exponent/exponent,jolicloud/exponent,exponentjs/exponent,jolicloud/exponent,exponentjs/exponent,exponent/exponent,exponent/exponent,exponentjs/exponent,jolicloud/exponent,exponentjs/exponent,exponent/exponent