Add eq and ne

[patel-zeel]

Adding eq and ne methods i) for general use; ii) to implement comparison based kernels in mlkernels.

[coveralls]

Pull Request Test Coverage Report for Build 1238302956

• 34 of 34 (100.0%) changed or added relevant lines in 6 files are covered.
• No unchanged relevant lines lost coverage.
• Overall coverage remained the same at 100.0%

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Totals
Change from base Build 1201032351:	0.0%
Covered Lines:	3057
Relevant Lines:	3057

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💛 - Coveralls

[wesselb]

Thank you, @patel-zeel. This looks great. :) Merging this now and releasing a new version.