- Conflict with old scour to avoid conflict on /usr/bin/scour

- Run spec-cleaner to remove few whitespacing problems

- require six >= 1.9.0

- version update to 0.37
* Fix escaping of quotes in attribute values.
* A lot of performance improvements.
* Fix exception when removing duplicated gradients while
`--keep-unreferenced-defs` is used.
* Remove some illegal optimizations of `m0 0` sub-path commands.
* Fix and improve handling of boolean flags in elliptical arc path
commands.
* Fix exception when using two-number forms of the filter attributes
`baseFrequency`, `order`, `radius` and `stdDeviation`.
* Improve whitespace handling in text nodes fixing an issue where
scouring added spaces in error and reducing file size in many cases.
* Drop official support for Python 3.3.
- etc. see HISTORY.md for details.
- build also python3 variant
- run unit tests
- package LICENSE and *.md