Update Worksheet.php

$Worksheet->removeColumn() param check !is_integer() changed to !is_numeric() to be more flexible but still validated inbound data.
Merge pull request #15 from KariTrace/patch-1

Update Worksheet.php
gitignore update
PSR-2, PHPDoc2, phpunit change or Sublime Text 2: comment or code formating.
Added addColumn method definition.
Needed a way to return the total count of rows. Added getRowCount().
$rwoCount param now optional. If not provided method will count the total rows.
Put addColumn() in the right place (after getCell, not before).
Removed param $colTitle, data now passes in as part of $colData, that is now an array
PSR-2, PHPDoc2, phpunit change or Sublime Text 2: comment or code formating.
Changed method definion to better match existing naming scheme.
Figured out we did not need getRowCount().
PSR-2, PHPDoc2, phpunit change or Sublime Text 2: comment or code formating.
$rowCount & $rowCount value setting refactored.
Added Iterations for $colData and $rowCount data points.
PSR-2, PHPDoc2, phpunit change or Sublime Text 2: comment or code formating.
Removed debug dump.
Removed extra loop definition
PSR-2, PHPDoc2, phpunit change or Sublime Text 2: comment or code formating.
row and col Count values done.