Added support for "disableOnClickOutside" property.

[dennis90]

Added functionality to do not close calendar when disableOnClickOutside is set to true.

Description

Motivation and Context

This pull request fixes bug #402, adding support for disableOnClickOutside documented property.

Checklist

[X] I have added tests covering my changes
[X] All new and existing tests pass
[ ] My changes required the documentation to be updated
  [ ] I have updated the documentation accordingly
  [ ] I have updated the TypeScript 1.8 type definitions accordingly
  [ ] I have updated the TypeScript 2.0+ type definitions accordingly

[simeg]

Hi @dennis90. I re-opened this PR because I like it. However, when I merge your changes with master one of the tests you wrote fails.

FAIL  test/tests.spec.js (6.04s)
  ● Datetime › with custom props › disableOnClickOutside=false

    expect(received).toBeFalsy()

    Expected value to be falsy, instead received
      true

I'm not sure why it's failing, if you want to you can investigate.

[dennis90]

@simeg thanks for your update,
I fixed the failing tests, you can see what was going on:

enzymejs/enzyme#1229

[simeg]

Cool, thanks! I'll remember to keep that component.update() in mind.