Add DateTime cell type.#17

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Zensey wants to merge 9 commits intoSTRML:masterfrom

Commits on May 11, 2016

Add new method: _addSheetDataHeader
Zensey
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Commits on Jun 14, 2016

Fix number format in order to parse correctly in MS Office
Zensey
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Commits on Dec 15, 2016

add argument ht (row height) to startRow()
Zensey
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Commits on Dec 16, 2016

add argument ht (row height) to startRow()
Zensey
committed