fixed addon class name
A test for the LessFilter
Separated add-on registration / Less engine initialization from actual
filter implementation.
Added back Less pipeline, with appropriate registration & unit test
Upgrade to lesscss 1.3.3
Enable server side includes in less processing, by providing a lesscss
ResourceLoader
Enable server side includes into less snippets embedded in HTML
templates
Merge pull request #54 from rkrzewski/less_includes

lesscss pipeline with server side includes support