fix countsTotal boxing regression that made it extremely slow, and cache it when frozen to avoid costly re-computation
fix gradient checker
make normalizeX option work
make output embeddings look at the correct array
add implementation of Vose's Alias Sampling algorithm for linear-space, constant-time sampling from discrete distributions
fix gradient tester
add option to use exact alias sampling with CBOW to pick negative examples
change default loss to log for embeddings to match word2vec, clean up negative sampling code
change back to default wsabie since log loss is giving bad results (maybe since not normalizing?)
Merge pull request #223 from lvilnis/embedding-fixes

Embedding fixes and better negative sampling