#517 Add `ViewContainerComponent` prop to `<DateTimePicker/>`
#517 Add `ViewContainerComponent` prop to `<DateTimePicker/>`

This allows users of the component to customize the implementation and add additional `View`s or other UI elements. When users supply a React.Component instead of just a DOM element (specified as a string), then the `openView` and `onChange` properties get passed to the component's implementation.

dmtrKovalenko/material-ui-pickers,rscnt/material-ui,mui-org/material-ui,mui-org/material-ui,callemall/material-ui,callemall/material-ui,callemall/material-ui,mbrookes/material-ui,mui-org/material-ui,oliviertassinari/material-ui,mbrookes/material-ui,oliviertassinari/material-ui,callemall/material-ui,dmtrKovalenko/material-ui-pickers,oliviertassinari/material-ui,rscnt/material-ui,rscnt/material-ui,mbrookes/material-ui