Fix bug: Don't wrap normal code with #if/#endif
Add qDebug support for XlsxColor
Code refactoring: Make Cell::isDateTime() reliable
There is no need to use UTC datetime
Add QTime read write support
Update examples
Merge branch 'master' into dev
Improve the QDate support
Improve worksheets support
Add basic worksheet copy support
Make sure that at least one worksheet exist in the workbook
Code refactoring: Cache worksheetNames
Issue 17: Using std::numeric_limits instead of macros INTn_MAX/MIN
Update version to 0.2.2