title: AirBnB React-dates not showing selected range
body: <p>I'm trying to add <a href="https://github.com/airbnb/react-dates" rel="nofollow noreferrer">AirBnB React-dates</a>. All of functionality working except one thing (Not opening the month of already  selected dates).</p>
  <p>When I'm assigning the start and end dates then it selects the range but not showing the selected month. It showing the current month instead.</p>
  <p>For example: If I set start date = 2017-05-05 and end date =2017-05-09 then it shows the selection, but in next time calendar picker open it only shows current month, so I have to click the next month, next month to see the previous selected dates;</p>
  <p>My code:</p>
  <pre><code>import React from 'react';
  import ReactDOM from 'react-dom';
  import moment from 'moment';
  
  import { DateRangePicker } from 'react-dates';
  
  
  var SelectedStartDate = moment('2017-05-05');
  var SelectedEndDate = moment('2017-05-09');
  
  
  class HomePageDatePicker extends React.Component {
  constructor(props) {
      super(props);
      this.state = {
          focusedInput: null,
          startDate: SelectedStartDate,
          endDate:SelectedEndDate
      };
      this.onDatesChange = this.onDatesChange.bind(this);
      this.onFocusChange = this.onFocusChange.bind(this);
  }
  
  onDatesChange({ startDate, endDate }) {
  
      this.setState({ startDate, endDate });
  }
  
  onFocusChange(focusedInput) {
      this.setState({ focusedInput });
  }
  
  render() {
      const { focusedInput, startDate, endDate } = this.state;
      return (
          &lt;div&gt;
              &lt;DateRangePicker
                  {...this.props}
                  onDatesChange={this.onDatesChange}
                  onFocusChange={this.onFocusChange}
                  focusedInput={focusedInput}
                  startDate={startDate}
                  endDate={endDate}                                     
                  startDateId=&quot;datepicker_start_home&quot;
                  endDateId=&quot;datepicker_end_home&quot;                    
                  startDatePlaceholderText=&quot;Check In&quot;
                  endDatePlaceholderText=&quot;Check Out&quot;
              /&gt;
          &lt;/div&gt;
      );
      }
  }
  </code></pre>
  <p>When I open the picker, it shows February instead of May.</p>