Fixes parameters passed to  for 0.6.2

docco#document() (version 0.6.2) only accepts 2 arguments. This PR is intended in fixing how the parameters are passed from the task configuration to Docco.

Tested with a number of configurations, it has grunt-docco run easily with Docco 0.6.2.

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Originally, when requesting the grunt-docco package from NPM I continously had the error : `spawn error, ENOENT`dwa