Feature/up vs total

[Thermatix]

• I've added the attribute online to the NodeMetrics struct
• I've added javascript to then display the number of up machines with updateUpVsTotal()
• I've refactored updateChart() to use a generic updateAggregateMetric()

[coveralls]

Pull Request Test Coverage Report for Build 213

• 0 of 1 (0.0%) changed or added relevant line in 1 file are covered.
• No unchanged relevant lines lost coverage.
• Overall coverage decreased (-0.06%) to 45.175%

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Changes Missing Coverage	Covered Lines	Changed/Added Lines	%
src/metrics/aggregator.rs	0	1	0.0%

Totals
Change from base Build 204:	-0.06%
Covered Lines:	323
Relevant Lines:	715

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💛 - Coveralls

[aheart]

@Thermatix thank you for the prompt adjustments. 👍 I see two fixup commits. Are you ok with me using githubs "Rebase and Merge" feature or would you prefer to rebase the branch yourself?

[Thermatix]

@aheart I can do it, I just wanted to wait to make sure it was ok with you first as I know how rebasing can be.

EDIT:

Just rebased it.