tidytext 0.1.5

Change how NA values are handled in unnest_tokens so they no longer cause other columns to become NA (#82).
Update tidiers and casters to align with quanteda v1.0 (#87).
Handle input/output object classes (such as data.table) consistently (#88).

tidytext 0.1.4

Fix tidier for quanteda dictionary for correct class (#71).
Add a pkgdown site.
Convert NSE from underscored function to tidyeval (unnest_tokens, bind_tf_idf, all sparse casters) (#67, #74).
Added tidiers for topic models from the stm package (#51).

get_sentiments now works regardless of whether tidytext has been loaded or not (#50).
unnest_tokens now supports data.table objects (#37).
Fixed to_lower parameter in unnest_tokens to work properly for all tokenizing options.
Updated tidy.corpus, glance.corpus, tests, and vignette for changes to quanteda API
Removed the deprecated pair_count function, which is now in the in-development widyr package
Added tidiers for LDA models from the mallet package
Added the Loughran and McDonald dictionary of sentiment words specific to financial reports
unnest_tokens preserves custom attributes of data frames and data.tables

Updated DESCRIPTION to require purrr >= 0.1.1.
Fixed cast_sparse, cast_dtm, and other sparse casters to ignore groups in the input (#19)
Changed unnest_tokens so that it no longer uses tidyr’s unnest, but rather a custom version that removes some overhead. In some experiments, this sped up unnest_tokens on large inputs by about 40%. This also moves tidyr from Imports to Suggests for now.
unnest_tokens now checks that there are no list columns in the input, and raises an error if present (since those cannot be unnested).
Added a format argument to unnest_tokens so that it can process html, xml, latex or man pages using the hunspell package, though only when token = "words".
Added a get_sentiments function that takes the name of a lexicon (“nrc”, “bing”, or “sentiment”) and returns just that sentiment data frame (#25)

Added documentation for n-grams, skip n-grams, and regex
Added codecov and appveyor
Added tidiers for LDA objects from topicmodels and a vignette on topic modeling
Added function to calculate tf-idf of a tidy text dataset and a tf-idf vignette
Fixed a bug when tidying by line/sentence/paragraph/regex and there are multiple non-text columns
Fixed a bug when unnesting using n-grams and skip n-grams (entire text was not being collapsed)
Added ability to pass a (custom tokenizing) function to token. Also added a collapse argument that makes the choice whether to combine lines before tokenizing explicit.
Changed tidy.dictionary to return a tbl_df rather than a data.frame
Updated cast_sparse to work with dplyr 0.5.0
Deprecated the pair_count function, which has been moved to pairwise_count in the widyr package. This will be removed entirely in a future version.