Coinbase button isn't ideal

- Unfortunately Coinbase does not allow us to set a custom amount.
- Bittip the only extension I can find using coinbase, is using oauth.

Saving the code, as the next commit will remove it.
Payments work! But, still needs a bit more work

- Payments with Dwolla do work, and donation amount is updated
  correctly.
- Removed Coinbase, seeking out a better alternative.
- Using personal VPS right now for redirection, will switch over to MIT
  once official.