Refactor auth response to json

[ebenezerdon]

This PR refactors auth response to json format
The auth response is now a json object with keys, token and success
PT story for this PR is ch[#161859749]

[coveralls]

Pull Request Test Coverage Report for Build 164

• 40 of 41 (97.56%) changed or added relevant lines in 7 files are covered.
• 3 unchanged lines in 3 files lost coverage.
• Overall coverage decreased (-0.8%) to 85.973%

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Changes Missing Coverage	Covered Lines	Changed/Added Lines	%
server/routes/middleware/validateinput.js	2	3	66.67%

Files with Coverage Reduction	New Missed Lines	%
server/routes/middleware/verify.js	1	93.55%
server/routes/middleware/validateinput.js	1	86.21%
server/routes/controllers/usersController.js	1	52.38%

Totals
Change from base Build 162:	-0.8%
Covered Lines:	505
Relevant Lines:	553

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💛 - Coveralls