Fix #64 - ensure to dedupe boot scripts array before running.

Because the bootDirs defaults to process.cwd(), if the user manually
includes scripts in the same directory, with out specifying a bootDir,
those scripts will be included multiple times.

Use underscore.uniq to remove duplicate file paths.

Fix #64.
That is incorrect. That is what the bug was. files.boot was 2 until I applied the patch. That's why boot scripts were being run twice.