termrec: HEAD - a program for recording "videos" of terminal output

`termrec` is an alternative to `ttyrec`, which extra features which I find useful:

- termrec [injects the terminal encoding information and screen size into the recording, whereas ttyrec does not](https://en.wikipedia.org/wiki/Ttyrec#Technical_file_format_specification).
- termrec allows live output, allowing user to `termrec -f live >(nc ...)`

This formula includes only HEAD version, because the latest stable version, 0.16, does not compile successfully on Mac OS X.