update gulp-compass to 2.0.0

Signed-off-by: Bo-Yi Wu <appleboy.tw@gmail.com>
Using the latest compass verions.

Signed-off-by: Bo-Yi Wu <appleboy.tw@gmail.com>
Merge pull request #46 from hackfoldr/patch

update gulp-compass to 2.0.0
regen for 7d70867