title: react-datepicker, issue with monthsShown by default
body: <p>We are using react-datepicker for our calendar implementation. the default months shown is controlled by <b>monthsShown</b> datepicker 
  component property. when we say 2- it shows Current Month + Next Month.</p>
  
  <p>I am using the reat DatePicker as below</p>
  
  <pre class="lang-js prettyprint-override"><code>&lt;DatePicker 
    customInput={&lt;CustomInput disableDateSelection={this.props.dateProps.disableDateSelection} /&gt;}
    className="w-dtsr-date-picker"
    selected={this.state.startDate}  //called when the date is clicked 
    onChange={this.handleChange}    //called only when the value is chnaged 
    monthsShown={2}     //number of months to be shown 
    minDate={this.props.dateProps.minDate}  //min days to be shown in the calendar 
    maxDate={this.props.dateProps.maxDate}  //max days to be shown in the calendar 
    onChangeRaw={this.handleDateChangeRaw}  //preventing the user from manually entering the dates or text in the input text box 
    dayClassName={date =&gt; date.getTime() === new Date(this.props.dateProps.defaultDate).getTime() &amp;&amp; this.props.dateProps.disableDefaultDate ? 'random' : undefined}
    //dayClassName - to disable the proposed forecast dates or actual dates if user has already selected/proposed the same forecast/actual dates
    disabled={this.props.dateProps.disableDateSelection}
  /&gt;
  </code></pre>
  
  <p>Is there a way to show Previous month and this month.?
  For Example if the current Month is April we wanted to show March and April instead of April - May.</p>