New option pieToPercentaje

This way, you can choose if convert pie charts to percentages or not (default: false)
Update readme: new option pieToPercentaje

Related to https://github.com/froodian/export-csv/pull/2
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Handles the case where this.title is undefined in a chart you are exporting.
Merge pull request #4 from jonhyman/feature/title-fix

Handles the case where this.title is undefined in a chart you are export...
Merge pull request #2 from alesnav/patch-1

New option pieToPercentage
Merge pull request #3 from alesnav/patch-2

Update readme: new option pieToPercentage