bug(md-select): change the arrow position to absolute

[jefersonestevo]

Fixes#3112

[crisbeto]

The CSS changes LGTM, but a couple of notes:

1. We don't need the extra demo.
2. Can you please rebase and squash your commits?

[crisbeto]

I don't think we need this example. The examples in the demo app are there to be able to click around the main use cases, they're not for actual testing.

[jefersonestevo]

@crisbeto conflicts resolved and I've removed the demo for flex layout from the demo page. Anything else that needs to change here?

[crisbeto]

Not code-wise, but you have a few merge conflicts which can cause issues with our scripts. Can you squash all your commits into one?

[jefersonestevo]

@crisbeto As these changes are really small and there are some merges with lots of commits here, I've created a new pull request with just the changes based on the current master. I'm closing this one and we can continue at #3580

[crisbeto]

Well, it's already done, but FYI you can still squash commits after the PR has been opened.

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