Feature/exchanges connect

Add mtgox logic, all donations addresses, refactore code, fix bugs

How to test:

    $ meteor reset
    $ meteor run --settings settings.json


Then open the page. You will see all CoinsManager addresses.
Click "sign in" and create an account.
You should see "Your addresses" appear.

Open the javascript debugger console. Type something like

    > Addresses.insert({userId: Meteor.user()._id, code: "BTC", address: "1CoinsManagerThisIsAFakeAddress"})