Correct locked cell detection (no information means locked).
Merge branch 'master' of ssh://github.com/doy/spreadsheet-parsexlsx
Improve locked cell detection for cells with hidden formulas.  Add test for locked cell detection.
Fix bug-15 test: (merged) cell B2 of the Format sheet is locked.
Add support for optional $formatter argument in parse method.
add TabColor support to ParseXLSX
add ColFmtNo support to ParseXLSX
Merge branch 'pull-25'
Merge pull request #26 from felliott/parseexcel-parity

Add TabColor and ColFmtNo support to ParseXLSX
avoid dying if these tags are missing (#23)
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