fixed undefined data error when creating the display
Merge branch 'master' of github.com:Wizcorp/csvparser
avoid writing undefined values
Merge pull request #12 from polco/displayBug

fixed undefined data error when creating the display with undefined values
0.1.16: Do not display undefined values
Do not need to use array.join operation when saving into this.rowMap
Revert back the same key check as we need it
Merge pull request #13 from cweihan/smallFix

Do not need to use array.join operation when saving into this.rowMap
0.1.17: Better handling of data with linebreaks and multiple columns as unique keys