[2/3] spark git commit: [SPARK-11717] Ignore R session and history files from git

[SPARK-11717] Ignore R session and history files from git see: https://issues.apache.org/jira/browse/SPARK-11717 SparkR generates R session data and history files under current directory. It might be useful to ignore these files even running SparkR on spark directory for test or development.

spark git commit: [SPARK-11717] Ignore R session and history files from git

Repository: spark Updated Branches: refs/heads/master ed04846e1 -> 2035ed392 [SPARK-11717] Ignore R session and history files from git see: https://issues.apache.org/jira/browse/SPARK-11717 SparkR generates R session data and history files under current directory. It might be useful to