Should `dict` be hardcoded into the path?

Hi, Nice work, very handy for those of use doing NLP in julia.

I though I could use the copy of Wordnet I already had from NLTK.
which depending on how NLTK is installed lived in `/nltk_data/corpora/wordnet`

However within the corpus directory for NLTK's copy are the index files directly -- they are not inside a `dict` subdirectory.
Since everything in the wordnet folder is inside the dict folder it is i guess not required.

Easy work around, either with simlinks or just downloading another wordnet copy.