Update webassets plugin to allow user to pass configuration settings to Webassets through their settings file. Also removed language about DEBUG not compiling CSS since as of at least webassets 0.8 this is no longer an issue.

docs/plugins.rst

@@ -183,10 +183,19 @@ The above will produce a minified and gzipped JS file:
     <script src="http://{SITEURL}/theme/js/packed.js?00703b9d"></script>
 
 Pelican's debug mode is propagated to Webassets to disable asset packaging
-and instead work with the uncompressed assets. However, this also means that
-the LESS and SASS files are not compiled. This should be fixed in a future
-version of Webassets (cf. the related `bug report
-<https://github.com/getpelican/pelican/issues/481>`_).
+and instead work with the uncompressed assets.
+
+Many of Webasset's available compilers have additional configuration options
+(i.e. 'Less', 'Sass', 'Stylus', 'Closure_js').  You can pass these options to
+Webassets using the ``ASSET_CONFIG`` in your settings file.
+
+The following will handle Google Closure's compilation level and locate
+LessCSS's binary:
+
+.. code-block:: python
+
+    ASSET_CONFIG = (('closure_compressor_optimization', 'WHITESPACE_ONLY'),
+                    ('less_bin', 'lessc.cmd'), )
 
 .. _Webassets: https://github.com/miracle2k/webassets
 .. _Webassets documentation: http://webassets.readthedocs.org/en/latest/builtin_filters.html