Fixed deprecation warnings for mongoose connection options

[ofuochi]

Fixed deprecation warnings for mongoose connection options. You can learn more about that here

[coveralls]

Pull Request Test Coverage Report for Build 1091

• 0 of 0 changed or added relevant lines in 0 files are covered.
• 218 unchanged lines in 13 files lost coverage.
• Overall coverage decreased (-88.4%) to 4.851%

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Files with Coverage Reduction	New Missed Lines	%
config/config.js	2	70.0%
config/param-validation.js	2	0.0%
config/winston.js	3	0.0%
server/auth/auth.controller.js	8	25.0%
server/helpers/APIError.js	8	16.67%
index.route.js	9	0.0%
server/user/user.route.js	9	0.0%
server/auth/auth.route.js	10	0.0%
server/user/user.model.js	14	0.0%
server/user/user.controller.js	21	0.0%

Totals
Change from base Build 1086:	-88.4%
Covered Lines:	12
Relevant Lines:	239

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💛 - Coveralls