Add term+ recipes

Please add recipes for term+ and its utilities.

* [term+](https://github.com/tarao/term-plus-el)
* [term+mux](https://github.com/tarao/term-plus-mux-el)
* [term+key-intercept](https://github.com/tarao/term-plus-ki-el)
* [key-intercept](https://github.com/tarao/key-intercept-el)
* [tab-group](https://github.com/tarao/tab-group-el)

## Reference

* [Author's blog post](http://d.hatena.ne.jp/tarao/20121021/1350844264) (Japanese)