Add support to leverage POI eventusermodel to read/parse XLSX files. Uses a streaming model to read the excel document, which uses less memory.
Refactor StreamingXSSF* to support extension of handler behaviors.
Code cleanup.
Bump version
Document purpose of spreadsheet 6, used in XSSFTabularDataSourceSpec and StreamingXSSFTabularDataSourceSpec a little better.  Spreadsheet 6 contains numeric with decimal portion, and a date, both susceptible to parsing issues.
Bump back version.
Upgrade to poi 3.10-FINAL.
mapper variable removed, it was useless.  ExcelCellMapper functionality is not yet supported by StreamingXSSFTabularDataSource.
Add change logs for next version.
Simplify some code.
Variable rename.
Readme.md additions for StreamingXSSFTabularData.
Fix typing issue.
Remove comment.
Correctly type this the Iterator.
Simplify iterator.  No need for the row number.
Merge pull request #2 from aheiss1/master

Add new type of TabularDataSource, building TabularDatas leveraging lower memory stream based POI eventusermodel