Add a property-namespacing-like replace strategy for browsers.

[searls]

Of course, td.replace() only works in Node.js, because quibble is coupled to Node's Module module. However, what if instead of throwing an error, the behavior was changed for browsers?

For instance:

var property = td.replace(some.object, 'property')

property // a test double created with the same rules as td.replace() for node

td.reset() // will restore all the replaced stuff

I like this a lot because it would increase the utility of testdouble.js on projects without marrying us to a module scheme. Conceivably, somebody could build a plugin using this as a primitive to add support for AMD or what-not.

Downsides to using the same td.replace name include possible confusion, however, since the behavior will be so different. I'm sure we could implement it without issue b/c browserify will load a different file, but I'm worried about the risk of confusion to users who might see a snippet or doc in one place which doesn't apply to the context they're using td.js in. JavaScript is hard.

[searls]

See some thoughts on approach in the docs https://github.com/testdouble/testdouble.js/blob/master/docs/7-replacing-dependencies.md#browser