capture/overwrite back button functionality, fixes #285

[coveralls]

Pull Request Test Coverage Report for Build 565

• 1 of 18 (5.56%) changed or added relevant lines in 2 files are covered.
• 2 unchanged lines in 2 files lost coverage.
• Overall coverage decreased (-0.9%) to 35.892%

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Changes Missing Coverage	Covered Lines	Changed/Added Lines	%
src/redux/actions.js	1	5	20.0%
src/index.js	0	13	0.0%
<!--	Total:	1	18	5.56%	-->

Files with Coverage Reduction	New Missed Lines	%
src/index.js	1	0.0%
src/redux/actions.js	1	15.97%
<!--	Total:	2		-->

Totals
Change from base Build 561:	-0.9%
Covered Lines:	224
Relevant Lines:	652

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💛 - Coveralls