'Generate a range of Epoch objects.
Similar to the Python range() method.  Returns the range [
start, stop ) at the requested step.  Each element will be a
Epoch object.
= INPUT VARIABLES
- start    The starting value of the range.
- stop     The stop value of the range.
- step     Step to use.
= RETURN VALUE
- Returns a list contianing the requested Epoch values.'

def range(start, stop, step):

    elems = []
    i = 0
    while True:
        d = (start + (i * step))
        if (d >= stop):
            break
        elems.append(d)
        i += 1
    return elems
