fix(input): fixes alignment issues between textareas and inputs

Closes #5462. Closes #5682.

Author: Robert Messerle

src/components/input/input.scss

@@ -24,6 +24,7 @@ md-input-container {
   position: relative;
   padding: $input-container-padding;
   margin: 18px 0;
+  overflow: hidden;
 
   &.md-block {
     display: block;
@@ -156,6 +157,11 @@ md-input-container {
     width: 100%;
     box-sizing: border-box;
 
+    // Hacky fix to force vertical alignment between `input` and `textarea`
+    // Input and textarea do not align by default:
+    // http://jsbin.com/buqomevage/1/edit?html,css,js,output
+    float: left;
+
     &:focus {
       outline: none;
     }