LDA does not return P(z|d) - distribution over topics given document

[bevankoopman]

First, thanks for producing a Julia implementation of LDA.

The implementation current returns P(w|z) - the distribution over words w for the set of topic z. However, it currently does not return the other distribution P(z|d) - the distribution over topics z for each document d.

It would be great if this could be included.

Thanks.

[aviks]

cc: @yukota