Importer file download

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

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Add the download API to Abp.Importer module

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

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Added API for downloading file from Importer ref #136

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

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• changed state from "new" to "resolved"