CRAN Release 0.2.0

CHANGES IN word2vec VERSION 0.2

• Extended predict.w2v with nearest if you pass on a vector or matrix. This allows to perform word2vec analogies or extract other similarities.
• Added word2vec_similarity
• Change classes returned by word2vec to 'word2vec_trained' and read.word2vec to 'word2vec'
• Add detailed docs of predict.word2vec and as.matrix.word2vec
• Added normalize option in read.word2vec usefull when wanting to extract the raw embedding (e.g. trained with other software)
• By default models trained with version 0.2 of this R package do normalization upfront before saving the model. For version 0.1 of this package this was not the case so load these in with option normalize set to TRUE
• Use Rcpp::runif as initialiser of embeddings instead of std::mt19937_64
• Functionalities default usage assumes UTF-8 encoding and predict.w2v now returns character text instead of factors
• Added read.wordvectors