Updated package.json with license, author, homepage, description, etc
3579 - Feura Sans is now Fira Sans on FirefoxOS
Merge pull request #3885 from mozilla/3579-fira-sans

3579 - Feura Sans is now Fira Sans on FirefoxOS

@callahad - You are right, I was blind. Merging.
Merge pull request #3881 from pdehaan/issue3869

Updated package.json with license, author, homepage, description, etc