fix(button): set vertical alignment for md-button and md-raised-button#1565

Merged

jelbourn merged 3 commits intoangular:masterfrom tinayuangao:button-alignment

Oct 26, 2016

Commits on Oct 21, 2016

Set vertical alignment for md-button and md-raised-button so md-icon inside is correctly aligned
tinayuangao
committed
revert the span change
tinayuangao
committed

Commits on Oct 25, 2016

Add comments for style
tinayuangao
committed