Adding function addNA (cf. https://github.com/juba/questionr/issues/12)
Fonction odds.ratio cf. https://github.com/juba/questionr/issues/13
Merge pull request #14 from larmarange/addNA

Adding function addNA (cf. https://github.com/juba/questionr/issues/12)
Add Joseph as author
On transforme odds.ratio en une méthode S3
Extension de la méthode odds.ratio aux tables 2x2 et aux objets de type facteur
Fix CRAN Url in README
Rename copy functions to clipcopy to avoid name collision with data.table
Moving memisc from Imports to Suggests in order not to break base aggregate.formula. Close #19
Merge odds.ratio functions
(Temporary ?) fix odds.ratio generic and methods arguments
Remove links to memisc in help pages
Fix S3 inconsistencies and documentation for odds.ratio. Close #13
Change addNA as addNAstr and remove code duplication. Close #18
Update NEWS
Update .gitignore
Update messages translations
Fix variable -> factor
Update date
ImportFrom highr in NAMESPACE, and replace global assignments with options() for shiny apps