When --watch is not supported, restart with --watchAll

[seanpoulter]

The change introduced in #325 incorrectly configured the Runner to start with --watchAll enabled. I'll take some of that blame for the unclear API. To use --watchAll you need to set true, true which isn't clear. 😞

Changes proposed in this PR:

• Change the watch mode flag from a Boolean to an enumeration: none, watch, watchAll
• Properly start the Runner with --watch and --watchAll
• Detect the error message when --watch is not supported and restart with --watchAll

Changes not proposed in this PR:

• No setting to "always use --watchAll" since we can detect when --watch fails
• Moving the error message detection into jest-editor-support. I know cpojer wants to add integration tests to make sure we catch if the text changes.

Testing:

• Manually tested using a workspace without a git or hg repo:

  index.test.js:

  describe('Test suite', () => {
    it('Test', () => {
      expect(1).toBe(2);
    })
  })

• Tests have been updated with a few redundant test cases removed

This will resolve #327.

[coveralls]

Pull Request Test Coverage Report for Build 375

• 18 of 20 (90.0%) changed or added relevant lines in 4 files are covered.
• 42 unchanged lines in 2 files lost coverage.
• Overall coverage increased (+0.006%) to 74.638%

---

Changes Missing Coverage	Covered Lines	Changed/Added Lines	%
src/JestExt.ts	1	3	33.33%

Files with Coverage Reduction	New Missed Lines	%
src/JestProcessManagement/JestProcess.ts	1	98.11%
src/JestExt.ts	41	53.35%

Totals
Change from base Build 374:	0.006%
Covered Lines:	598
Relevant Lines:	764

---

💛 - Coveralls

[orta]

👍 cool, yeah, makes sense

I'll ship a release