New PR from "only_go_and_js"#5

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Diminho wants to merge 4 commits intomasterfrom

Commits on Mar 9, 2018

added error to DB struct. modified error handling in file_provider. added ctx to newServer
Dima U
committed
removed debug from main
Dima U
committed
user model modified. error handling
Dima U
committed
added error handling to NewApp
Dima U
committed