feature: handles integer return type for SWTH contract + reduces network requests for balance info

[comountainclimber]

What current issue(s) from Trello/Github does this address?

What problem does this PR solve?

How did you solve this problem?

How did you make sure your solution works?

Are there any special changes in the code that we should be aware of?

Is there anything else we should know?

• Unit tests written?

[coveralls]

Pull Request Test Coverage Report for Build 7692

• 8 of 33 (24.24%) changed or added relevant lines in 1 file are covered.
• 5 unchanged lines in 1 file lost coverage.
• Overall coverage decreased (-0.1%) to 41.581%

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Changes Missing Coverage	Covered Lines	Changed/Added Lines	%
app/actions/balancesActions.js	8	33	24.24%

Files with Coverage Reduction	New Missed Lines	%
app/core/nep5.js	5	27.78%

Totals
Change from base Build 7681:	-0.1%
Covered Lines:	1501
Relevant Lines:	3276

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💛 - Coveralls