Go version of @AlexPoulson's ESI format.
See original repo for more info: https://github.com/AlexPoulsen/esi
This package is compatible with the "image" package. See esiconv/main.go for a very simple example of usage.
esiconv is a conversion tool, and also serves as an example for this package's usage.
Get pre-built binaries on the Releases page, or go-get via
go get -u github.com/kayteh/esi/esiconv