Fixes #3166 -- add a (simpler) flag to suppress the generated header.

Author: jashkenas

lib/coffee-script/command.js

@@ -43,6 +43,7 @@ SWITCHES = [
   ['-m', '--map',             'generate source map and save as .map files']
   ['-n', '--nodes',           'print out the parse tree that the parser produces']
   [      '--nodejs [ARGS]',   'pass options directly to the "node" binary']
+  [      '--no-header',       'suppress the "Generated by" header']
   ['-o', '--output [DIR]',    'set the output directory for compiled JavaScript']
   ['-p', '--print',           'print out the compiled JavaScript']
   ['-s', '--stdio',           'listen for and compile scripts over stdio']
@@ -319,7 +320,7 @@ compileOptions = (filename, base) ->
     filename
     literate: opts.literate or helpers.isLiterate(filename)
     bare: opts.bare
-    header: opts.compile
+    header: opts.compile and not opts['no-header']
     sourceMap: opts.map
   }
   if filename