Merge pull request #1 from schnere/master

fixed invoice subtotal calculation failure
Added Modman module description file
Refactored the module to an own namespace to prevent problems with Magento native cash on delivery payment method
Added option for an percentage fee
Fixed typo and visible HTML Tag in the invoice PDF
added composer and readme
renamed readme
renamed readme
renamed readme
fixed composer
fix composer
fix modman
Refactored the totals handling and added CoD totals to creditmemos and guest orders