[Tooltip] allow configuration of the hide delay

[rolandjitsu]

Bug, feature request, or proposal:

Feature

What is the expected behavior?

TOOLTIP_HIDE_DELAY should be configurable even though according to the specs is set to be 1.5 seconds.
Ideally, a user should configure it via an opaque token:

import {TOOLTIP_HIDE_DELAY} from '@angular/material';

@NgModule({
    providers: [
        {provide: TOOLTIP_HIDE_DELAY, useValue: 450}
    ]
})
export class MyModule {}

What is the current behavior?

Currently you cannot configure the timing.

What are the steps to reproduce?

Providing a Plunker (or similar) is the best way to get the team to see your issue.
Plunker template: http://plnkr.co/edit/o077B6uEiiIgkC0S06dd

What is the use-case or motivation for changing an existing behavior?

Some users may wish to hide the tooltip earlier than the spec dictates.

Which versions of Angular, Material, OS, browsers are affected?

2.0.0-alpha.10

Is there anything else we should know?

[clcarter]

Is a configurable delay for open() on the roadmap as well?

[aciccarello]

@t0f3rchr15 See #3286

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