Added TimeSeries conversion method to DFrame
Added TimeSeries conversion method to DFrame

ioam/holoviews,basnijholt/holoviews,ioam/holoviews,basnijholt/holoviews,vascotenner/holoviews,vascotenner/holoviews,ioam/holoviews,vascotenner/holoviews,mjabri/holoviews,basnijholt/holoviews,mjabri/holoviews,mjabri/holoviews