Kens fix for dfm man
Allow dfm to create bigrams
Fix arguments
Var name fix
Fix in input and output values
Output fix
Fix stopwords removal
Allow users to chose coverting to lower case of not
little fix
Allow more than one-word distance
Fix the out put value
Allow seting window size and sorting
Fix example
Fix example
merging
merging dfm
added export for bigrams to roxygen
some updates to examples
tidying and demo for ngrams
added missing library(quanteda) line