Decouple renderNumbers prop from renderHouseMarks prop

[jnorvell]

Thank you for writing this component. Here is a small feature request:

for the settings props, could you make these props independent of each other:

                 renderHourMarks={false}
                 renderMinuteMarks={false}
                 renderNumbers={true}

Unfortunately, if I only want the numbers without the marks, it will not render. The hour numbers only seem to render if the renderHouseMarks={true}