Add preliminary specs for the bunny publisher.
user
```ruby
require 'spec_helper'

describe Travis::Amqp::Publisher do
  let(:connection) {Travis::Amqp.connection}
  before do
    Travis::Amqp.config = {
      host: 'localhost'
    }
    connection
  end
  let(:publisher) {Travis::Amqp::Publisher.new('reporting')}
  let(:queue) {
    queue = connection.queue('reporting')
    exchange = connection.exchange('reporting.jobs.1', :durable => true, :type => :topic, :auto_delete => false)
    queue.bind(exchange, :key => 'reporting')
    queue
  }

  let(:message) {
    queue.pop
  }

  it "should encode the data as json" do
    publisher.publish({})
    message.should_not == nil
    message[:payload].should == "{}"
  end

  it "should default to a direct type" do
    publisher.type.should == "direct"
  end

end
```
assistant