Merge pull request #1977 from edx/goncha/sass-cache

Goncha/sass cache #os

AUTHORS

@@ -99,3 +99,4 @@ Florian Dufour <neurolit@gmail.com>
 Manuel Freire <manuel.freire@fdi.ucm.es>
 Daniel Cebrián Robles <danielcebrianr@gmail.com>
 Carson Gee <cgee@mit.edu>
+Gang Chen <goncha@gmail.com>

rakelib/assets.rake

@@ -46,6 +46,7 @@ def sass_cmd(watch=false, debug=false)
     end
 
     "sass #{debug ? '' : '--style compressed'} " +
+          "--cache-location /tmp/sass-cache " +
           "--load-path #{sass_load_paths.join(' ')} " +
           "#{watch ? '--watch' : '--update'} -E utf-8 #{sass_watch_paths.join(' ')}"
 end