Revert "Fix compiler warnings in slime.el."

This reverts commit 65205ed58873df26d306121c8d76d523cb3e9a11 which
was misguided. The warning appears to be related to the advice set
by the slime-references contrib.
Switch to the SVG version of the Travis CI badge
Disable the sbcl-pprint-patch

Fixes issue #212.
Add port changing restart to setup-server

Allows binding swank to a different port if the provided one is busy
delete trailing whitespace
strike one towards future-macro restart-loop
factor out socket-quest
factor out AST sugar macro restart-loop
Merge pull request #204 from adlai/patch-1

Add port changing restart to setup-server