Update examples/init.el to match changes made in e4418c37
Rename haskell-interactive-greetings to haskell-process-greetings

The only use of that defvar was in haskell-process.el anyway, so this
commit moves it there to reduce module-interdeps.

This addresses #167
Mark haskell-interactive-mode-reset-error to be autoloaded

This is a workaround for haskell-process.el depending on
haskell-interactive-mode.el and should help address #167.