Bug: Multiline Input Display Issues

[sigmundch]

From @term1nal (originally reported in dart-archive/paper-elements#44):

Firefox 31, Ubuntu 14.04 Unity

• On the expanding multi-line input, you continue to add new lines, the blue line continues to push its way down the page, but the text input area stays the same initial size, and just scrolls down. Also, this pushes elements down below the main card. It does not continue to expand downward, inhibiting access to elements that get pushed off of it (scrolling the page does not work).
• Pixel alignment is off with the static multi-line, making the line cut into the text.

[shycherry]

There is also a display problem for css-sized-multiline-floatinglabel input :

[morethanreal]

Fixed FF issues in 44a48ba.