Bundles support#1

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watari wants to merge 5 commits intomasterfrom

generate_command

Commits on Jun 28, 2018

Updated logic for generate command. Introduced interfaces for Configuration ConfigurationBuilder
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Updated logic for migrate command.
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Updated logic for version and execute commands. Refactored CommandHelper
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Commits on Jul 7, 2018

Fixed unit tests
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Commits on Jul 21, 2018

Added command that is fix BC caused by introducing prefix for migrations.
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