Add utm_medium and utm_source
Add utm_content tag
Add utm_campaign and utm_term
Improve comments
Social network links
Fix social network links
Easier to read
Better explanation in read me.md
URL encode campaign url tags
Many elements are now optional
Change the default links
Images and can't read files on the cloud
Engaging unsubscribe url (Spain)
Prepare unsubscribe text for text versions
Title lead and image is optional as a block
Text templates
Add tracking on text templates