Update .gitignore

.gitignore

@@ -1,12 +1,55 @@
-.Rproj.user
+# History files
 .Rhistory
+.Rapp.history
+
+# Session Data files
 .RData
 
+# User-specific files
+.Ruserdata
+
+# Example code in package build process
+*-Ex.R
+
+# Output files from R CMD build
+/*.tar.gz
+
+# Output files from R CMD check
+/*.Rcheck/
+
+# RStudio files
+.Rproj.user/
+
+# produced vignettes
+vignettes/*.html
+vignettes/*.pdf
+
+# OAuth2 token, see https://github.com/hadley/httr/releases/tag/v0.3
+.httr-oauth
+
+# knitr and R markdown default cache directories
+*_cache/
+/cache/
+
+# Temporary files created by R markdown
+*.utf8.md
+*.knit.md
+
+# R Environment Variables
+.Renviron
+
+# pkgdown site
+docs/
+
+# translation temp files
+po/*~
+
 # compiled objects
 *.o
 *.so
 
-# for emacs
-*~
-[#]*[#]
-.\#*
+# readme preview
+README.html
+
+# package check logs
+..Rcheck