Add mongo-object

[harryadel]

Autoform relies on mongo-object internally but doesn't state it as an explicit NPM dependency because it's one of the sub dependencies of simple-schema which you get it by default when you install simpl-schema. The problem comes apparent only when you remove the simpl-schema NPM package.

[jankapunkt]

Shouldn't we rather api.mply Mongo Object in the simple schema Meteor package?

[harryadel]

@jankapunkt what led me to create this issue is that once I removed the NPM version, I had a client error stopping my application from booting till I installed the mongo-object as an NPM version.