Add rounding to work sessions

[Wittionary]

        # Round the elapsed session UP or DOWN based off of how JH does it

<= 3 == 0 mins

>3, <=18m == 15 mins

        # >18m, <=33m       == 30 mins
        # >33m, <=48m       == 45 mins
        # >48m              == 60 mins