md5
hashes the given input and returns its MD5 checksum.
Syntax
md5 INPUT
{{ md5 "Hello world, gophers!" }}
<!-- returns the string "b3029f756f98f79e7f1b7f1d1f0dd53b" -->
This can be useful if you want to use Gravatar for generating a unique avatar:
<img src="https://www.gravatar.com/avatar/{{ md5 "your@email.com" }}?s=100&d=identicon">