iteratee "drop" requires more input than necessary

[Akio Takano]

Hi,

I expect the attached program to output:

0 1 (done) 2 3 4 5
0 1 (done) 2 3 4 5

However I get:

0 1 (done) 2 3 4 5
0 1 2 (done) 3 4 5

This is because the (drop n) iteratee demands the next element in the
stream after skipping n elements. This is unnecessary, and I think
it's more convenient if it does not, especially when processing
real-time data using iteratee library.

I included a patch to change the behavior.

Regards,
Takano Akio
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