* sly.el (sly-disconnect): `interactive' arg must be optional
* README.md (Fork): Explain the "why of SLY"
Fix gray stream issue for SBCL

The pretty printer seems to call the non-standard
stream-line-length generic function.

* lib/lisp/backend/swank-sbcl.lisp (sb-gray:stream-line-length):
  Implement default.

(cherry picked from SLIME commit
b3bd68064b2012eca6b61cc938288f6c245acbe9)

Conflicts:
	ChangeLog
Minor cleanup in slime-parse-tests.el

* test/slime-parse-tests.el (form-up-to-point.1): Don't
hardcode swank::%cursor-marker% use the slime-cursor-marker
constant instead.

(cherry picked from SLIME commit
228285b8bee3289c28e6a8b086174d7ce1be5cfd)

Conflicts:
	contrib/ChangeLog
	contrib/test/sly-parse-tests.el
Only test contribs that actually have tests.

* Makefile (CONTRIB_TESTS): New variable.

(cherry picked from SLIME commit
fac577dd49c2e3d716d7ebef801d5ef4f7ce668b)

Conflicts:
	contrib/ChangeLog
	contrib/Makefile