nitpick: rename examples from program.rl to program.c.rl

[milahu]

so the file extension shows the embedded language

each compile step removes one extension

ragel atoi.c.rl -o atoi.c
gcc atoi.c -o atoi

atoi.c.rl
atoi.c
atoi

or

atoi.go.rl
atoi.go
atoi