Add specs to test EventReporter
user
```ruby
require 'graphite_client'
require File.expand_path(File.dirname(__FILE__) + '/spec_helper')

describe "GraphiteClient::EventReporter" do
  before do
    @url         = 'http://example.com/path'
    @uri         = URI(@url)
    @event       = {'what' => 'test', 'tags' => 'test', 'data' => 'test'}
    @basic_auth  = {:username => 'test', :password => 'test'}
  end

  it "should create an HTTP connection and POST to it" do
    Net::HTTP.should_receive(:new).with(@uri.host, @uri.port).and_return(http = mock())
    Net::HTTP::Post.should_receive(:new).with(@uri.request_uri).and_return(req = mock())
    req.should_receive(:body=).with(@event.to_json)
    http.should_receive(:request).with(req)
    event_reporter = GraphiteClient::EventReporter.new(@url)
    event_reporter.report(@event)
  end

  it "should reuse the same HTTP connection" do
    Net::HTTP.should_receive(:new).with(@uri.host, @uri.port).and_return(http = mock())
    Net::HTTP::Post.should_receive(:new).with(@uri.request_uri).and_return(req = mock())
    req.should_receive(:body=).twice.with(@event.to_json)
    http.should_receive(:request).twice.with(req)
    event_reporter = GraphiteClient::EventReporter.new(@url)
    event_reporter.report(@event)
    event_reporter.report(@event)
  end

  context "with basic auth" do
    it "should create an HTTP connection and POST to it, using basic auth" do
      Net::HTTP.should_receive(:new).with(@uri.host, @uri.port).and_return(http = mock())
      Net::HTTP::Post.should_receive(:new).with(@uri.request_uri).and_return(req = mock())
      req.should_receive(:basic_auth).with(@basic_auth[:username], @basic_auth[:password])
      req.should_receive(:body=).with(@event.to_json)
      http.should_receive(:request).with(req)
      event_reporter = GraphiteClient::EventReporter.new(@url, basic_auth: @basic_auth)
      event_reporter.report(@event)
    end
  end
end
```
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