Update app/code/community/FireGento/Pdf/Model/Invoice.php

- added handling for returned page-variable after insertTotals (finxing problems with multipage invoices)
- removed erroneous call for insertPageCounter because printing pagecounter is already done in _addFooter()
Merge pull request #32 from skrollme/patch-1

Update app/code/community/FireGento/Pdf/Model/Invoice.php