Pyprind

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- Minor reorganization of the generator interface.
- Minor changes to the code documentation.
- Added new test files.

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- New generator functions for progress bar and percentage indicators via:

for i in pyprind.prog_bar(range(n)):
do something
pass

for i in pyprind.prog_percent(range(n)):
do something
pass

(by Olaf Gladis, https://github.com/hwmrocker)

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- A new `.stop()` method to stop the progress bar / percentage indicator early.
- `.update()` method accepts an `item_id` argument now in order to display
which item is currently processed next to the progress bar / percentage indicator.
E.g.,
Job1
0% 100%
[] | ETA[sec]: 0.000 | Item ID: file_xyz.csv

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- Version intentionally skipped to not cause confusion that
this is a tool exclusively for Python 2.7.

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- Fixed bug that the report was squeezed after the bar and before the "time elapsed" string if printed immediately after the progress bar has reached 100%.

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- Small bugfix on some system a warning was printed although
a valid output string was provided.