Traverse dictionary at a given level

[stanleyjs]

Hi,

I would like to iterate over all of the keys / items of a given level.

Ideal behavior:

d=benedict()
d['a'][0] = 0
d['a'][1] = 1
d['b'] = 0

print(d.keypaths(level=0))
>>> ['a','b']
print(d.keypaths(level=1))
>>>['a.0','a.1']

And similar functionality for items and other iterators...

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[fabiocaccamo]

Duplicate of #49, improving the traverse method a level and max_depth options could be added.