noocyte/Utility.ExcelIO — pull request #1 by andersosthus (2014-12-03 20:17:55+00:00)
Title: Updated reader/writer to work with EPPlus 4

Assuming EPPlus has changed it's internals, so we got ```NullReferenceExceptions``` in ```IterateOverRows``` due to the fact that ```ExcelWorksheet worksheet``` seems to have been closed or disposed at that point.

For ```CreateExcelFile```, the issue was that when ```package.Save();``` was called, that closed and disposed the stream we were working on. Now we instead call ```package.SaveAs(outputStream);``` which is a separate stream that we return.