fix(button): fixes style inconsistencies between md-buttons using a and button under the hood

Closes #2440

Author: Robert Messerle

src/components/button/button.scss

@@ -40,7 +40,7 @@ $icon-button-margin: rem(0.600) !default;
 
   outline: none;
   border: 0;
-  display: inline-block;
+  display: inline-table;
   padding: $button-padding;
   margin: $button-margin;
   line-height: $button-line-height;