Add fake.timeOfDay()

[serhalp]

We frequently need to generate a string representation of a time of day in Good Eggs code.

We have a documented standard for the format to use for manipulating and storing such a string: HH:mm. This is e.g. 14:00.

However, we also frequently have a need to generate user-facing time of day string representations, which would usually be a different format, such as 2pm, 2:00 pm, or 2:00:00 pm. Since we do not have a standard for such a format (appropriately so, I think – this is a design concern, and we have disparate types of audiences... customers, employees, engineers, etc.), it seems difficult to design a convenient, expressive method for this that would not introduce bugs.

I'm not sure on this one. I would propose we start with just adding fake.timeOfDay() which generates our standard documented HH:mm format.