add selectable activity sample

[a-b-r-o-w-n]

closes #1117

TODO:

• a11y

[coveralls]

Pull Request Test Coverage Report for Build 820

• 0 of 0 changed or added relevant lines in 0 files are covered.
• No unchanged relevant lines lost coverage.
• Overall coverage decreased (-0.04%) to 47.287%

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Totals
Change from base Build 811:	-0.04%
Covered Lines:	785
Relevant Lines:	1496

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💛 - Coveralls

[corinagum]

Do we want to include a11y in this PR, as well as selecting an activity programmatically? If not, we shouldn't close #1117 or file a new bug. :)

[a-b-r-o-w-n]

Do we want to include a11y in this PR, as well as selecting an activity programmatically? If not, we shouldn't close #1117 or file a new bug. :)

I'm not sure the programatic selection makes sense (there is another example showing integration with the redux store) which can be expanded to add the programatic selection. I am working on a11y now. I'll push up a new commit shortly.

[corinagum]

Created #1632 for discussion / tracking for a sample of programmatically selectable activities.