Log message:
Update py-webassets to 0.11.

0.11 (2015-08-21)
    - Add libsass filter (Mantas, sirex).
    - Add SlimitIt filter (Michael Fladischer).
    - Prevent filters from crashing if the input file is empty (empty string
      passed).
    - A number of smaller improvements.

Log message:
Update py-webassets to 0.10.1.

0.10.1 (2014-07-03)
    - Python 3 fixes.
    - Windows fix (Ionel Cristian Mărieș).

0.10 (2014-06-15)
    - Add autoprefixer filter (Vincent Driessen).
    - Add require.js filter (metagriffin, Erik Taubeneck)
    - A lot of bug fixes and small improvements.

Log message:
Mark packages as not ready for python-3.x where applicable;
either because they themselves are not ready or because a
dependency isn't. This is annotated by
PYTHON_VERSIONS_INCOMPATIBLE=  33 # not yet ported as of x.y.z
or
PYTHON_VERSIONS_INCOMPATIBLE=  33 # py-foo, py-bar
respectively, please use the same style for other packages,
and check during updates.

Use versioned_dependencies.mk where applicable.
Use REPLACE_PYTHON instead of handcoded alternatives, where applicable.
Reorder Makefile sections into standard order, where applicable.

Remove PYTHON_VERSIONS_INCLUDE_3X lines since that will be default
with the next commit.

Whitespace cleanups and other nits corrected, where necessary.

Log message:
PYTHON_VERSIONS_INCOMPATIBLE cleanup.

Log message:
Update py-webassets to 0.9.

0.9 (2013-10-25)
    webassets now support Python 3, and drops support for Python 2.5.

    - Filter for Closure Soy templates (Michael Su).
    - less filter can output source maps (Riccardo Forina).
    - Support .pyc only deployments (Mike C. Fletcher).
    - Jade template filter (Roshambo).
    - YAMLLoader improvements (incl. Cédric Reginster).
    - The gzip filter was removed.

Log message:
Import webassets-0.8 as www/py-webassets.

Asset management application for Python web development - use it
to merge and compress your JavaScript and CSS files.