created the mixin
namespaced the debug class a bit.
allowed the type line-height to scale up and down with html font-size
Update _typesettings.scss

Minor typo fix.
Merge pull request #17 from paolodina/patch-1

Update _typesettings.scss
Merge branch 'master' into gh-14-debug-vertical-alignment

Conflicts:
	_typesettings.scss
Merge pull request #15 from ianrose/gh-14-debug-vertical-alignment

Debug Vertical Alignment