Can't use Gray streams for ABCL

* swank/abcl.lisp (make-output-stream, make-input-stream): Use
ext:make-slime-output-stream because ABCL's Gray streams don't
work well enough.
* swank-loader.lisp (*sysdep-files*, *swank-files*): Don't load
swank/gray.lisp for ABCL.
* slime-autodoc.el (slime-retrieve-arglist): Renamed

back from slime-autodoc--retrieve-arglist as it's still
used in slime-c-p-c.el
Just testing travis.
Switch test order to see what Travis does.
Remove trailing whitespace from swank/abcl.lisp
Release 2.10