Handle new pandas versions, fix travis CI #8
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the current behavior is that if the model is not defined,
it will be created through the pd.DataFrame constructor, missing
the index, which is later used in the funciton, leading to a
KeyError
Remove the now deprecated iterkv -> iteritems
Cast n_array to integer
In the current behavior, it can be a float and lead to the
raise of a TypeError
raises a FutureWarning otherwise
Cleaner main
Fix travis CI