Doc changes. No value is yielded in Workbook::matrixto.
Workbook::sheetdata now accepts only 1 parameter (the workbook.xml file)
Options back in sheetdata
Added sheet_collection method, to ease inheritance
Fixed doc: :values parameter was never used - removed
matrixto now accepts the complete options hash
changed matrixto docs to reflect api change
Buildsheet accepts options instead of i. The matrix size is affected by the pagination or the range selection