development snapshot

not functional right now. in the process of deleting hidden columns. The error is in the function excelWorkbookChanged. To make it function, comment out references to $ryExcelWorksheetAssoc and uncomment $this->_ryWorksheets[]
removes hidden columns

hidden columns are now removed from what is displayed
removes hidden columns

hidden columns are now removed from what is displayed.
removed unused function
removes hidden columns

hidden columns are now removed from what is displayed.
removed unused function
toArray() \n to <br>

When calling toArray, the default parameter will convert a newline character to a <br> in every cell of the given array so it can display properly in HTML.