Add 2 more JavaScript interpreters (#4783)
Add 2 more JavaScript interpreters (#4783)

* Add 4 more JavaScript interpreters

* Remove SlimerJS and MuJS

christop/linguist,erkyrath/linguist,sebgod/linguist,erkyrath/linguist,github/linguist,erkyrath/linguist,pchaigno/linguist,sebgod/linguist,erkyrath/linguist,pchaigno/linguist,github/linguist,christop/linguist,github/linguist,pchaigno/linguist,sebgod/linguist,pchaigno/linguist,sebgod/linguist,github/linguist