Remove all rxjs/add/... imports from the library code

[IgorMinar]

Bug, feature request, or proposal:

Please remove all imports starting with rxjs/add/... and replace them with the side-effect free version.

This will also mean that you can no longer expect the operators to be monkey-patched on the prototype which makes material code uglier, but the benefit is that the application developers will not hit cases where some operators are available and others aren't where the availability of operators can change via innocent refactoring of internals of Angular Material.

In other words by using rxjs/add imports, every call you make becomes part of your public api and the operator added in this way will have to be retained even when you stop using it because removing it would be a breaking change.

What is the expected behavior?

Proper usage: example from @angular/router https://github.com/angular/angular/blob/5efc86069ff92d980bb460c15deccb1e0fff9363/packages/router/src/apply_redirects.ts#L10-L19

What is the current behavior?

Example code with rxjs/add/... import: https://github.com/angular/material2/blob/c524438b70510af0a27fe4e53c1970b8a42f0705/src/lib/tooltip/tooltip.ts#L33

there are several more importas like this throughout the repo:

aio/node_modules/@angular/material/autocomplete/autocomplete-trigger.js:2
aio/node_modules/@angular/material/bundles/material.umd.js:2
aio/node_modules/@angular/material/core/overlay/scroll/scroll-dispatcher.js:1
aio/node_modules/@angular/material/dialog/dialog-container.js:1
aio/node_modules/@angular/material/icon/icon-registry.js:6
aio/node_modules/@angular/material/select/select.js:1
aio/node_modules/@angular/material/sidenav/sidenav.js:1
aio/node_modules/@angular/material/tabs/tab-body.js:1
aio/node_modules/@angular/material/tabs/tab-group.js:1
aio/node_modules/@angular/material/tabs/tab-header.js:1
aio/node_modules/@angular/material/tooltip/tooltip.js:1

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

2.0.0-beta.2

Is there anything else we should know?

I'm working with @Blesh to fix this using something like a pipe operator: https://twitter.com/IgorMinar/status/844348523869016066

[jelbourn]

Dupe of #2622

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