Jest support documentation about enzyme

[lelandrichardson]

@blainekasten this is great. I have a PR out that i'm going to be adding some documentation stuff to. There will end up being a "guides" section, where there is a guide for working with various different environments (of which, jest will be one). This will be very helpful to add to that!

[blainekasten]

For reference: recently, I needed to add "underscore" to the unmocked paths also.

[lelandrichardson]

This is good. I'll get something like this added into a guide for using enzyme with jest

[blainekasten]

Also for reference, this list is primarily for npm3 due to jestjs/jest#554.

When using with npm2 and when that is fixed, it should be fine to just use

{
  "jest": {
    "unmockedModulePathPatterns": [
      "enzyme"
    ]
  }
}