Map M-SPC to 'cycle-spacing rather than the default 'just-one-space

Thanks @sachac
Diminish interactive-haskell-mode correctly

`interactive-haskell-mode` is defined in haskell.el and without this change I'm getting `File mode specification error: (error "interactive-haskell-mode is not currently registered as a minor mode")` whenever I open a .hs file.
Merge pull request #240 from osener/patch-1

Diminish interactive-haskell-mode correctly
.hi files are now added to completion-ignored-extensions by haskell-mode
Enable eldoc-mode in haskell-mode
Merge branch 'master' of https://github.com/purcell/emacs.d