Fix autocomplete clear button's position when floating label is used

[xomaczar]

This closes #539

[miguelcobain]

@xomaczar thanks for the PR.
Can you summarize this change?
What exactly happened to the backport? Is it just a copy-pasted version of latest AM styles for autocomplete?

[xomaczar]

@miguelcobain Sure, no problem - tried to comment as much as I could.

1. The backported autocomplete style is simply a copy-pasted version of the latest AM styles @1.1.1
2. In the new AM autocomplete style the md-autocomplete-suggestions-containers height/max-height properties were removed, so to make it compatible I added those back. (Later on we can make the necessary autocomplete changes in paper-autocomplete/component.js and remove height/max-height from css - match AM style)

Hope this helps.

[xomaczar]

@miguelcobain does that explain my changes?

[xomaczar]

can you merge this PR?

[xomaczar]

rebased