[FFe] python-django-compressor 2.0

I'd like to rev django-compressor to 2.0; this is a two version jump from 1.5 and brings some important improvements, but will require MIR's for three extra packages:

    - python-rjsmin
    - python-rcssmin

These two where vendored into the django-compressor source tree.

    - python-csscompressor

Most importantly this brings us inline with what the OpenStack project are testing with upstream, which will minimize and bugs caused by a diff in version in this component (supports the OpenStack dashboard).

>>>>>>>>>>>>>

Upstream changelog:

v2.0 (01/07/2015)
-----------------

`Full Changelog <https://github.com/django-compressor/django-compressor/compare/1.6...2.0>`_

- Add Django 1.9 compatibility

- Remove official support for Django 1.4 and 1.7

- Add official support for Python 3.5

- Remove official support for Python 2.6

- Remove support for coffin and jingo

- Fix Jinja2 compatibility for Django 1.8+

- Stop bundling vendored versions of rcssmin and rjsmin, make them proper dependencies

- Remove support for CSSTidy

- Remove support for beautifulsoup 3.

- Replace cssmin by csscompressor (cssmin is still available for backwards-compatibility but points to rcssmin)

v1.6 (11/19/2015)
-----------------

`Full Changelog <https://github.com/django-compressor/django-compressor/compare/1.5...1.6>`_

- Upgrade rcssmin and rjsmin

- Apply CssAbsoluteFilter to precompiled css even when compression is disabled

- Add optional caching to CompilerFilter to avoid re-compiling unchanged files

- Fix various deprecation warnings on Django 1.7 / 1.8

- Fix TemplateFilter

- Fix double-rendering bug with sekizai extension

- Fix debug mode using destination directory instead of staticfiles finders first

- Removed some silent exception catching in compress command

>>>>>>>>>>>>>

2.0 has been in Debian for some time; however for various reasons I've not got to it prior to now.

Proposed merge changelog:

  * Merge from Debian unstable. Remaining changes:
    - d/p/disable-coffin-tests.patch: Dropped, no longer required as
      upstream dropped support for coffin.
    - d/control: Drop BD's on django-discover-runner and csstidy; not
      required in Ubuntu.
    - d/control: Drop BD's on coffin and jingo, no longer supported
      upstream.
    - d/control: Drop (Build-)Depends on django-overextends and
      django-sekizai, as these are optional dependencies.
    - d/p/disable-django-sekizai.patch: Skip django-sekizai if its not
      installed.

minimizing the dependency list by skipping some optional framework support.