Add footer to Routes, and remove from CaseContainer

[nbarlowATI]

Remove copyright bar from grid display in CaseContainer, and instead have as a div with class "App-footer" (and include styling via App.css) in Routes.js. This will ensure it is always at the bottom of the screen.

[coveralls]

Pull Request Test Coverage Report for Build 2053791842

• 0 of 0 changed or added relevant lines in 0 files are covered.
• No unchanged relevant lines lost coverage.
• Overall coverage remained the same at 90.534%

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Totals
Change from base Build 2053785278:	0.0%
Covered Lines:	966
Relevant Lines:	1067

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💛 - Coveralls