Drop NodeJS dependency in favor of pure-python lesscpy

While less.js from lesscss.org is still the most standard-compliant (err
defining) LESS implementation, a pure-python one will drasticly simplify
deployments.

Since lesscpy doesn't support {outfile} just write to stdout,
django_compressor will happily take that (See
http://django-compressor.readthedocs.org/en/master/settings/#django.conf.settings.COMPRESS_PRECOMPILERS)

Drop dependency documentation, there are no external (non-Python) tools
left to setup.

Meanwhile, lesscpy(>=0.9j) supports SVG stylesheets.

Change-Id: I89ed102f7be4b554a28b001c9c0d40dab4a51ae6

Author: saschpe

MANIFEST.in

@@ -1,4 +1,3 @@
-recursive-include bin *.js
 recursive-include doc *.py *.rst *.css *.js *.html *.conf *.jpg *.gif *.png *.css_t
 recursive-include horizon *.html *.css *.js *.csv *.template *.tmpl *.mo *.po
 recursive-include openstack_dashboard *.html *.js *.less *.mo *.po *.example *.eot *.svg *.ttf *.woff *.png *.ico *.wsgi *.gif *.csv *.template
@@ -12,7 +11,6 @@ include manage.py
 include README.rst
 include run_tests.sh
 include tox.ini
-include bin/less/lessc
 include doc/Makefile
 include doc/source/_templates/.placeholder
 include requirements.txt

README.rst

@@ -20,21 +20,6 @@ For issue tracking:
 
  * https://bugs.launchpad.net/horizon
 
-Dependencies
-============
-
-To get started you will need to install Node.js (http://nodejs.org/) on your
-machine. Node.js is used with Horizon in order to use LESS
-(http://lesscss.org/) for our CSS needs. Horizon is currently using Node.js
-v0.6.12.
-
-For Ubuntu use apt to install Node.js::
-
-    $ sudo apt-get install nodejs
-
-For other versions of Linux, please see here:: http://nodejs.org/#download for
-how to install Node.js on your system.
-
 
 Getting Started
 ===============