Add a list of Projects

This adds a new section to the Bitcore website that lists projects.  After talking to a ton of people about what they're doing with Bitcore, I wanted to give them a place to list (read: link to) their projects, to help get them more engaged.

Since the site is static, I had to code it into the HTML itself, but ideally I'd like to make this simply a JSON document that gets read and displayed on the site (and is subsequently available as data).  Mergeable presently.