Feature/94 order items

[nbarlowATI]

Sort the order of ids of children when returning the JSON from the case details view.
This may or may not help with #94 , in determining the order in which items are drawn in mermaid.

Also set the polling rate for CaseContainer to 5s rather than 2s.

[coveralls]

Pull Request Test Coverage Report for Build 2165997241

• 1 of 1 (100.0%) changed or added relevant line in 1 file 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 2096216201:	0.0%
Covered Lines:	966
Relevant Lines:	1067

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💛 - Coveralls

[mhauru]

Looks good