Add ${temp_file} marker to cmd

Implicit adding of the `${temp_file}` by the framework has been deprecated and SublimeLinter also logs about it.

Author: kaste

linter.py

@@ -2,7 +2,7 @@
 
 
 class CSSLint(Linter):
-    cmd = 'csslint --format=compact'
+    cmd = 'csslint --format=compact ${temp_file}'
     regex = r'''(?xi)
         ^.+:\s*   # filename