Cell object stores the formatted text in the `.w` field
- Raw format and types are preserved in the `.t`, `.v` fields
- Accessors have been updated to use the field
updates for older OOXML:
- ECMA-376 makes reference to old sstItem shared string item
- [MS-XLSX] xmlns for workbook
- merged test repo with xls
- travis integration
- shifted to Apache 2.0 LICENSE
- mocha tests
The shift to Apache 2.0 was long overdue. It's becoming clear that compliance
requires deeper integration with the xls libraries and other implementations
whose specifications are covered under the OSP. It was a grave oversight for
the ISO and ECMA people to not try to implement parsers themselves, for if they
did I suspect the outcome would have been much different
