Fix chunk rounding off by one issue

[PVince81]

Fixes #175

Please review/test @dpickem @SergioBertolinSG

[mention-bot]

@PVince81, thanks for your PR! By analyzing the history of the files in this pull request, we identified @cosenal, @Gomez and @individual-it to be potential reviewers.

[SergioBertolinSG]

This will behave different in python 2 and python 3.
Python 2 - math.ceil(10/3) == 3.0
Python 3 - math.ceil(10/3) == 4.0

Doing
using from __future__ import division
The division in python2 results float. Not sure if adding this will break other things.

[PVince81]

argh... I thought maybe simply converting to float explicitly here. Will try.

[PVince81]

python2: math.ceil(float(10)/float(3)) => 4.0
python2: int(math.ceil(float(10)/float(3))) => 4
python3: math.ceil(float(10)/float(3)) => 4

that will do

[PVince81]

Actually... this is not an issue because back then I added this code after computing the chunk count:

        if size % chunk_size > 0:
            chunk_count += 1

but the approach with math.ceil might be more understandable

[SergioBertolinSG]

👍