dbunit Merge Request #6: Apache POI liblary version up from "3.2-FINAL" to "3.11". (merged)

To correspond to a newest version of "Apache POI liblary", it was changed.

The change point of a file.

pom.xml

• poi is upgraded "3.11".
• Add dpendency "poi-ooxml".

XlsDataSet.java

• "org.apache.poi.hssf" a package class is exchanged to "org.apache.poi.ss.usermodel" package interface.
• Used a WorkbookFactory class for reading of Excel file. (It's possible to read both of them of xls,xlsx.)

XlsDataSetWriter.java

• "org.apache.poi.hssf" a package class is exchanged to "org.apache.poi.ss.usermodel" package interface.
• "Make a workbook" part moved to new method(createWorkbook(), for overriding).

XlsTable.java

• "org.apache.poi.hssf" a package class is exchanged to "org.apache.poi.ss.usermodel" package interface.

src/test/java/org/dbunit/dataset/excel/AllTests.java

• A test class (XlsxDataSetTest.java,XlsxTableTest.java) is added for new Excel file format test.
• Those classes are carried out by a suite.

src/test/resources/xml

• A data file (dataSetTest.xlsx, tableTest.xlsx) is added for new excel file format test.