Update return value for cell

cell.$t encodes HTML text if used in spreadsheet. cell.inputValue
return text as written.
Add option to use cell text values or as typed

Cell data will return as parsed text. This option will allow you to get
cell data as typed if set to false.
Revert "Update return value for cell"

This reverts commit 35216b6fe24196e0ab22fb17a4d257a24dd3a2c7.

Conflicts:
	lib/util.js
fix for conflict
Merge pull request #40 from jleplomet/stable