Refactored tests to run using `meteortesting:mocha`#269

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SimonSimCity wants to merge 2 commits intovsivsi:masterfrom SimonSimCity:meteortesting-mocha

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Commits on Mar 21, 2018

Refactored tests to run using meteortesting:mocha
SimonSimCity
committed

Commits on Apr 30, 2018

Fixed import for npm module 'chai'
SimonSimCity
committed