Added Additional Test Coverage, Toggling of Encryption using CLI

[xhxh96]

Close: #124 Close: #60

[coveralls]

Pull Request Test Coverage Report for Build 735

• 9 of 10 (90.0%) changed or added relevant lines in 4 files are covered.
• No unchanged relevant lines lost coverage.
• Overall coverage increased (+3.7%) to 82.775%

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Changes Missing Coverage	Covered Lines	Changed/Added Lines	%
src/main/java/seedu/address/logic/parser/AddressBookParser.java	0	1	0.0%
<!--	Total:	9	10	90.0%	-->

Totals
Change from base Build 734:	3.7%
Covered Lines:	2965
Relevant Lines:	3582

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💛 - Coveralls