Include price in generated bitcoin address link

[fromheten]

• - [x] Add amount and label to API response

Currently the response looks like this: {"display":"payment.prompt","address":"13bVTp72EEYf7hmTydr6CSBU7bhfFFijxV"}.

It should be more like

{
  'address': '13bVTp72EEYf7hmTydr6CSBU7bhfFFijxV',
  'satoshis': '100000',
  'label': 'Momona: This awesome title of a blog post'
}

• - [x] Remove unused fields

The display field is not used, and should be removed. We can add it when it's a feature we need. Right now it's just some extra bytes we add every time for no reason.

• - [x] Update the client to show the amount, and include it in the bitcoin: address to include the amount. It will be automatically filled into the users bitcoin wallets when they click the link. This has issue number 5 in the web project.

[fromheten]

I think this can be closed, to doing that. Let me know if I missed something @mattgstevens