Patch fs to get missing existsSync.

… port)

  Allows multiple emacs programs to be open and benefit from jshint-mode
  at the same time. A server is started on the lowest unused port in the
  (configurable) range 3003 to 3100.

  The server gets a new argument --lastport INT. The flymake-hook filters
  stdout for the "Server started" message and extracts the port from there.

…inified sections)

  This adds an HTTP POST parameter called 'showCode' to enable/disable
  showing code evidence lines after each error line. Hiding error code
  snippets dramatically reduces the amount of data returned.

  Errors in minified content would cause the full line to be returned for
  each error. Flymake is slow at parsing content, in blocks of 4KiB, to the
  point where using jshint-mode on minified files or files with long lines
  caused emacs to hang.

  the default value for showCode is '0', hiding content.