publicclass/spreadsheet — pull request #3 by baryon (2012-02-21 07:49:48+00:00)
Title: added worksheetArray method and some properties for spreadsheet and worksheet, and some test cases

### added by baryon

* [Feature] Add worksheetArray method.
* [Feature] Add author, title, updated timestamp, sheetCount property for spreadsheet
* [Feature] Add title and updated property for worksheet
* [Bug] Fixes for empty cell, now return null when the cell is an empty object.
* [Feature] Add some test cases for added method and properties.