strip comments

fixes #422
Revert "strip comments"

This reverts commit 6378f10e0c43b9066bb102445a0c5b5f9fe775c7.
Fixed partial reference name in getChildren() for partials in subfolders
refactored partialization to its own method

cleaned up same directory case
updated changelog
Fix test assertion (seems the filter now returns even more compressed CSS?)
more generic exception message
restored PathUtils for BC with 1.1-alpha
updated changelog
Updated AssetCollection to not add several time the same variable in path
Merge pull request #495 from jeremyFreeAgent/fix/1.1.x-sameVarSeveralTimeInPath

Updated AssetCollection to not add several time the same variable in path