Add faces for Git commit

Update some Org faces as well:
- Remove `overline' from `ol3',
- Remove default underlining for `org-ellipsis',
- Remove `strike-through' from `org-headline-done',
- Add `org-agenda-block-count' for future patch (in progress).
Boldify `warning' and add 'helm-buffer-process'
Update comint highlight faces
Merge branch 'refs/heads/master' into personal

Conflicts:
	leuven-theme.el