input: Add invalid styles for firefox

[epelc]

Right now in firefox if your input has required min max etc set, and it isn't valid you end up with a big red box around it. We should replace this box with the correct material styles for errors which can be found here.

What you see now

To remove the red border you need to add the following(we may want to only apply this to inputs with md-input-container but probably not).

input:invalid {
    box-shadow: none;
}