[Fix #663] Make guru-mode warn by default
Move prelude-ido-goto-symbol to prelude-core
Fix
Clean up a bit prelude-ido-goto-symbol
[Fix #580] Preserve symbols order in prelude-ido-goto-symbol
Merge remote-tracking branch 'bbatsov/master'

* bbatsov/master:
  [Fix #580] Preserve symbols order in prelude-ido-goto-symbol
  Clean up a bit prelude-ido-goto-symbol
  Fix
  Move prelude-ido-goto-symbol to prelude-core
  [Fix #663] Make guru-mode warn by default

Conflicts:
	core/prelude-mode.el