Fixed interpolateData function

[MikeHeiber]

Utils:
-updated interpolateData function to remove x-val equality check which can cause issues with log-spaced x-val data with small magnitudes

Resolves #40

[coveralls]

Pull Request Test Coverage Report for Build 61

• 1 of 1 (100.0%) changed or added relevant line in 1 file are covered.
• No unchanged relevant lines lost coverage.
• Overall coverage decreased (-0.002%) to 99.174%

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Totals
Change from base Build 59:	-0.002%
Covered Lines:	840
Relevant Lines:	847

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💛 - Coveralls