Support absolute @import
“Absolute” imports are relative to the meteor root directory
Revert "Add a note about https://github.com/LearnBoost/stylus/issues/1677"

This reverts commit 220e5b85b640810daefa102339a12ebaf2213816.
Rename tests files
XXX For some weird reason (meteor bug?) it is not possible to name
file `nib.styl` or `jeet.styl`. Use a temporary underscore in the name.
Bump version to 1.0.6