fix issue #96 - changed default for $column_end from null to -1 in ExcelSheet::readRow() documentation
fix issue #96 - documentation for ExcelSheet::readRow()
added further reading section to readme
fix issue #86 - missing format for empty cells
updated documentation for $format in ExcelSheet::read()
Merge branch 'fix86'
resolved merge conflict for changed ExcelSheet::read() docs
Merge pull request #97 from johmue/fix96

fix issue #96 - documentation for ExcelSheet::readRow()
Fixedbug #86
changed docs for ExcelSheet::read()
Merge remote-tracking branch 'origin'
reversed custom patch for issue #86 and patched with solution from origin