User Profile Links

[drewroberts]

Users (#20) will need the ability to update their profiles with Links to their own website and social media profiles. I will probably call the model Profile Links because it will also be used for the profiles of Companies (TIPOFF/seo#13) & Locations (TIPOFF/locations#42) and potentially other polymorphic relationships.

Since these Links will depend on the Domains (TIPOFF/seo#14) & Webpages (TIPOFF/seo#19) models of the SEO package, it makes sense to add them to tipoff/seo instead of this authorization package and just have optional relationships on the User model to Links if the SEO package is installed.