DELETE api in stationAppService

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Original report by Luca Bruno (Bitbucket: lukkia, GitHub: lucabruno91).

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Implement the following APIs in stationAppService:

• delete station
• delete sensor
• delete measure

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Original comment by Luca Bruno (Bitbucket: lukkia, GitHub: lucabruno91).

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Delete APIs for StationsAppService added ref #152

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Original changes by Luca Bruno (Bitbucket: lukkia, GitHub: lucabruno91).

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• changed state from "new" to "resolved"