[added] Don't focus after render if we don't want to

[imadha]

Fixes #306 .

Changes proposed:

• Adds a shouldFocusAfterRender prop, defaults to true

Upgrade Path (for changed or removed APIs):

• No upgrade necessary

Acceptance Checklist:

• All commits have been squashed to one.
• The commit message follows the guidelines in CONTRIBUTING.md.
• Documentation (README.md) and examples have been updated as needed.
• If this is a code change, a spec testing the functionality has been added.
• If the commit message has [changed] or [removed], there is an upgrade path above.

[coveralls]

Coverage remained the same at 87.24% when pulling dd609f3 on imadha:do-not-focus-modal-by-default into 2adb45d on reactjs:master.

[coveralls]

Coverage remained the same at 87.24% when pulling dd609f3 on imadha:do-not-focus-modal-by-default into 2adb45d on reactjs:master.

[coveralls]

Coverage remained the same at 87.24% when pulling dd609f3 on imadha:do-not-focus-modal-by-default into 2adb45d on reactjs:master.

[diasbruno]

Hi @imadha, can you update the documentation for this feature?

[diasbruno]

Forget the previous comment. Everything is ok.

[diasbruno]

Released v2.3.1. Thank you @imadha.

I think we need to update the documentation telling that it's not recommended to disable the focus due to some problems with accessibility and, perhaps, should be only used in case of using react-modal as a base component for other components. Any thoughts?

[diasbruno]

Approved.