test cases for searchTopics

[bradywales]

• Changed parts of searchTopics(), and added test cases to account for it.
• In order to assert our code is working after changes are made while working on issue #5.
• By adding tests to test/topics.js, the test cases run when "npm run test" is executed.
• Passes all tests, including new ones.

[coveralls]

Pull Request Test Coverage Report for Build 4310020330

• 4 of 4 (100.0%) changed or added relevant lines in 1 file are covered.
• 10 unchanged lines in 5 files lost coverage.
• Overall coverage decreased (-0.04%) to 84.951%

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Files with Coverage Reduction	New Missed Lines	%
src/admin/versions.js	1	83.33%
src/groups/join.js	1	92.05%
src/controllers/admin/dashboard.js	2	85.26%
src/database/mongo/sorted.js	2	92.7%
src/database/mongo/hash.js	4	88.07%
<!--	Total:	10		-->

Totals
Change from base Build 4308654450:	-0.04%
Covered Lines:	22586
Relevant Lines:	25344

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💛 - Coveralls