Jest not supported in all use cases

[kylecannon]

Related to #99 and #100

After digging into the code in shallow-render, I found a couple of instances where there needs to be some refinements to support jest in all instances.

Here are the problem areas I've identified so far:

shallow-render/lib/models/renderer.ts

Line 144 in eab5583

spyOn(value, 'emit').and.callThrough();

shallow-render/lib/tools/ng-mock.ts

Line 52 in 7292bf9

spyOn(this, key).and.callThrough();

This isn't blocking me (yet), but a couple of spots were missed.

[getsaf]

Nice catch! I'll get a PR in for those soon.