* Add 1st version of migrate
* Put migration logic into Configurator
* add test to bank store migration
* add test for configurator
* Error if no migration found
* Remove RunMigrations from Configurator interface
* Update spec
* Rename folders
* copy-paste from keys.go
* Fix nil map
* rename function
* Update simapp/app.go
Co-authored-by: Robert Zaremba <robert@zaremba.ch>
* Update simapp/app_test.go
Co-authored-by: Robert Zaremba <robert@zaremba.ch>
* Adderss reviews
* Fix tests
* Update testutil/context.go
Co-authored-by: Robert Zaremba <robert@zaremba.ch>
* Update docs for ConsensusVersion
* Rename to forVersion
* Fix tests
* Check error early
* Return 1 for intiial version
* Use MigrationKeeper
* Fix test
* Revert adding marshaler to Configurator
* Godoc updates
* Update docs
Co-authored-by: Robert Zaremba <robert@zaremba.ch>
Co-authored-by: Aaron Craelius <aaron@regen.network>
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