Update gtm.phtml

enable dynamic remarketing for product pages, this should be move to the model in Gtm.php
add google dynamic remarketing tags and clean up the template files
create a package file
cleaning up some old comments
add files for php build
add files for php build
add files for php build
add files for php build
add files for php build
add files for php build
add files for php build
add files for php build
add files for php build
add files for php build
add files for php build
add files for php build
Merge digibeuk/Magento_GoogleTagManager fork with dynamic remarketing into canonical master.