Ported code!

We are porting to Python 3.x the code for Hierarchical LDA available here: https://github.com/joewandy/hlda

`class` `NCRPNode`[source]

NCRPNode(num_levels, vocab, parent=None, level=0, random_state=None)

`class` `HierarchicalLDA`[source]

HierarchicalLDA(corpus, vocab, alpha=10.0, gamma=1.0, eta=0.1, seed=0, verbose=True, num_levels=3)

`load_vocab`[source]

load_vocab(file_name)

`load_corpus`[source]

load_corpus(file_name)