Simplify test pattern matching.

[cpojer]

Fixes #925, #317, #290.

I'm starting to refactor how we find tests. This removes testFileExtensions and testDirectoryName in favor of a regex option for testsPattern. I tried to maintain the old config options with an adapter in normalize for now so that this isn't a breaking change. In a future release we'll add a warning and in a future-future release we will actually remove both options.

cc @DmitriiAbramov would really appreciate a review.

[aaronabramov]

sometimes it's really convenient to specify multiple patterns, e.g.

["/__server_tests__", "/__browser__tests__"]

or

["/_unit_/", "/_integration_"]

which can be done with a single regex but becomes too complicated :)

also if we even support glob patterns, should we rename this config option to regex? so eventually we can have

{
  testRegex: ["/__tests__/(.*)\\.js[x]?", "(?!node_modules)"]
}

or

{
  testPattern: ["**/__tests__/*.js?(x)", "!node_modules"]

[cpojer]

I'll create a new pull request as I "accidentally" used master for this one. I'll follow your suggestion and call it testRegex.

[ghost]

Any update on this? Is there a new PR that I can follow?

[cpojer]

I was on vacation and am currently working on bringing this back to life :)

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