new package : cjs. Part 1 of the Cinnamon desktop

This is part 1 of the Cinnamon desktop. 

This one is blocked by bug 1284.

Issues still of this pacakage:

 m4 warnings :  made a upstream bug report : https://github.com/linuxmint/cjs/issues/3
not checking if mozjs is compiled with the right parameters: https://github.com/linuxmint/cjs/issues/4

Roelof