Add a warning about the brokenness of the sass package to the docs (issue #143).
Add a warning about the brokenness of the sass package to the docs (issue #143).

sass.js implements a version of Sass much older than the .sass (let alone
currently recommended .scss) described at sass-lang.com, and has poor error
handling so it mostly just ends up confusing users. sass.js's author now uses
stylus/nib. We should probably remove the sass package, but let's not add
another breaking change to 0.5.0.

Hansoft/meteor,Hansoft/meteor,Hansoft/meteor,Hansoft/meteor,Hansoft/meteor,Hansoft/meteor,Hansoft/meteor