[CM] Snd 15.1

[Bill Schottstaedt]

Snd 15.1.

Juan Reyes donated his Leslie instrument, rotates, in leslie.cms
  and leslie.ins (in clm).

s7 now has a s7webserver directory containing Kjetil Matheussen's
  s7 web repl.

Mike Scholz updated the Forth and Ruby scripts.

checked: sbcl 1.2.4|5, gtk 3.14.0|1|2|3|4, 3.15.0|1

Thanks!: Kjetil Matheussen, Juan Reyes, Mike Scholz.