Improve API Umbrella error handling

[mauriciovieira]

This task is related to task #357. An issue was created on brylie:meteor-api-umbrella to enhance the error handling. After this issue is finished some work must be performed according to instructions left in the commit: 229a7de

[mauriciovieira]

Maybe it is a duplicate of #604

[bajiat]

@mauriciovieira You commented that you would be interested in #638. This is a related task. Could you take this one as well?

[bajiat]

One function remains that does not have proper error handling: https://github.com/apinf/meteor-api-umbrella/blob/master/server/apiUmbrellaWeb.js#L264

[bajiat]

@frenchbread This is another smallish task. Would you be interested in taking this?

[frenchbread]

Yup.

[frenchbread]

PR #9.