Replace ascii cue to visual cue

Change old school ascii "underline" style cue to a visual cue by writing installing package title in brighter green.

This is especially convenient when you install 10 packages at once.

Just a proposition. Pending review.

See #374 @ https://github.com/chocolatey/chocolatey/issues/374
Merge remote-tracking branch 'Redsandro/patch-2' into stable

* Redsandro/patch-2:
  Replace ascii cue to visual cue