Add typescript declarations

[pascalmartin]

Hi

I use typescript in my project and i made the typescript declarations file for wemo-client module, The declaration file is not 100% complete but it a good base for other contributor.

http://www.typescriptlang.org/docs/handbook/declaration-files/publishing.html

Exemple of use:

import Wemo = require('wemo-client');

const wemo: Wemo.Wemo = new Wemo();

wemo.discover((err: Error, device: Wemo.IDevice): void => {
    if (err) {
        Logger.log('error', err);
        return;
    }

    const client: Wemo.IClient = wemo.client(device);

    // ...
});

[codecov-io]

Codecov Report

Merging #58 into master will not change coverage. The diff coverage is n/a.

@@           Coverage Diff           @@
##           master      #58   +/-   ##
=======================================
  Coverage   86.41%   86.41%           
=======================================
  Files           2        2           
  Lines         287      287           
  Branches       47       47           
=======================================
  Hits          248      248           
  Misses         39       39

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[timonreinhard]

I'm not so much into Typescript but I'd say either make the declarations complete or leave them out altogether, right?