func map additions to handle golang convention while executing templates with id fields
func map additions to handle golang convention while executing templates with id fields

Signed-off-by: Alexandre Beslic <04d9a05e497d0dc841dc48eb0098b8fed917defe@abronan.com>

moul/protoc-gen-gotemplate,moul/protoc-gen-gotemplate,moul/protoc-gen-gotemplate,moul/protoc-gen-gotemplate