[DOC beta] Clarify context of a component's block.
[BUGFIX beta] Add preventDefault option to link-to and action.

Resolves #3737
Merge pull request #3855 from rjackson/add_prevent_default_option

[BUGFIX beta] Add preventDefault option to link-to and action.
Merge pull request #3862 from rjackson/add_action_context_tests_for_component

[DOC beta] Clarify context of a component's block.