Fixed Github 367 - TS-111

[fboucquez]

Hi @rg911

This PR fixes #367 / https://nem.atlassian.net/browse/TS-111

Have a look when you have time.

[coveralls]

Pull Request Test Coverage Report for Build 878

• 0 of 0 changed or added relevant lines in 0 files are covered.
• No unchanged relevant lines lost coverage.
• Overall coverage remained the same at 100.0%

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Totals
Change from base Build 874:	0.0%
Covered Lines:	10
Relevant Lines:	10

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💛 - Coveralls

[fboucquez]

Hi @rg911,

I've just added some small DTO mapping improvements. toModel kind of methods that can be reused when converting rest DTOs to model objects. Have a look