supporting tag display names

- being able to take tag "display names" as input
  - ie "Winnie The Pooh" becomes '/winnie-the-pooh'
  - ie "Michael J. Fox" becomes '/michael-j-fox'
- known edge cases include:
  - 'http://replygif.net/t/raven-symone' having name: Raven-Symoné
  - 'http://replygif.net/t/dul%C3%A9-hill' having name: Dulé Hill