`Event` type in button causes error during nodejs precompilation

[jeffbcross]

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https://github.com/angular/material2/blob/master/CONTRIBUTING.md#question.
This repository's issues are reserved for feature requests and bug reports.

• Do you want to request a feature or report a bug?

Bug

• What is the current behavior?

If I use prerender libraries for angular universal to precompile a component that uses MdButton, it fails as soon as the compiled button.js module is loaded because of the presence of a global Event object that doesn't exist in node.

This line is the offender: https://github.com/angular/material2/blob/d4a3cde52ba736da64285bdfaf039129d0dd8312/src/components/button/button.ts#L122

Because of the HostListener decorator, the type information for that method gets preserved as follows:

__decorate([
        core_1.HostListener('click', ['$event']),
        __metadata('design:type', Function),
        __metadata('design:paramtypes', [Event]), // <-- there's the problem
        __metadata('design:returntype', void 0)
    ], MdAnchor.prototype, "haltDisabledEvents", null);

• Which version of Angular and Material, and which browser and OS does this issue affect?
  Did this work in previous versions of Angular / Material?
  Please also test with the latest stable and snapshot versions.

Beta.1 and Beta.2.

• Other information
  (e.g. detailed explanation, stacktraces, related issues, suggestions how to fix)

ReferenceError: Could not require 'angular-cli-build.js': Event is not defined
    at project/node_modules/@angular2-material/button/button.ts:121:37
    at Object.<anonymous> (project/node_modules/@angular2-material/button/button.ts:94:1)
    at Module._compile (module.js:413:34)
    at Object.Module._extensions..js (module.js:422:10)
    at Module.load (module.js:357:32)
    at Function.Module._load (module.js:314:12)
    at Module.require (module.js:367:17)
    at require (internal/module.js:16:19)
    at Object.<anonymous> (project/src/client/app/issue-cli.ts:7:1)
    at Module._compile (module.js:413:34)

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