Merge pull request #1530 from katrinleinweber/patch-1

ignore OAuth2 token

R.gitignore

@@ -11,3 +11,6 @@
 # produced vignettes
 vignettes/*.html
 vignettes/*.pdf
+
+# OAuth2 token, see https://github.com/hadley/httr/releases/tag/v0.3
+.httr-oauth