Extend `cloneBlock` function to use like `cloneRow` but without table#459

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totpero wants to merge 3 commits intoPHPOffice:masterfrom

Commits on Jan 1, 2015

I have extend `cloneBlock` function, i have add another parameter `$incrementVariables` default TRUE;
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Commits on Jan 2, 2015

corect the regex : get only valid tag name
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correct some bugs from build
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