git attributes to align eol
extend options, algin with decided syntax
whitespace
Add modified (self altering) visitor pattern and class
Add import visitor
Move importing into visitor
organise the import node a bit better. eval the node before fetching
make import use shared relative path function
make import visitor stack up frame scopes
first test and fixes for simple implementation
import interpolation finished. refactored the import phase to occur only within the import visitor - so that the import eval env can be passed between imports.
alpha build
move action out of constructor
join selector visitor creation
move selector joining into visitor
cleanup join selectors from toCSS
make visitor replacing optional
Add an extend finder visitor and extend processor visitor (breaks extend for now)
move extend fully into visitor, bringing back functionality and fixes #1165
Update tree.js

in windows system,path sep is '\',the old regexp is not match it. I whrite a
new regexp and fix it;