* add some functionality to RandomValueGen's GetRandomDate method:
  - can specify min/max time for the DateTime to fall in
  - can specify boolean of dateOnly to chop off time
* add some DateTime extensions to PeanutButter.Utils:
  - StartOfDay / EndOfDay
  - AsHoursAndMinutes / AsTimeString convenience methods
  - AsTimeOnly: returns DateTime.MinValue with the time components from
    your DateTime
  - WithTime: returns your DateTime with the time modified as per the
    input
* remove some dead code