- no pollution of the Array prototype
- alignment with js-xls CFB code
- removed main code in CFB (use cfb bin instead)
- more tests
- added dist
- correect for incorrect tree level pointers
It is possible for multiple streams to have the same name (albeit with different
paths), so:
- `FileIndex` is an array of the streams
- `FullPaths` is an array of the full paths
- `FullPathDir` is a full path version of `Directory`