Revert "Add ruby flycheck checker locally until it is restored upstream"

This reverts commit 4c387b5e3426f5bbddbbf3054961a2b45a3a27bc.
Ensure TAB delegates to auto-complete in c/c++ modes (fixes #153)
Defer loading of cl-lib-highlight
Fix binding of sanityinc/eval-last-sexp-or-region
Don't details in dired by default in trunk emacs
Merge remote-tracking branch 'upstream/master'