Log Message:
Import ruby-roo-2.3.1 as math/ruby-roo.

Roo implements read access for all common spreadsheet types. It can handle:

* Excel 2007 - 2013 formats (xlsx, xlsm)
* LibreOffice / OpenOffice.org formats (ods)
* CSV
* Excel 97, Excel 2002 XML, and Excel 2003 XML formats when using
  the roo-xls gem (xls, xml)
* Google spreadsheets with read/write access when using roo-google

Untested, but packages fine.