Vault prefix usage and generation refactor (#197)
Vault prefix usage and generation refactor (#197)

* remove support for matching env files using .yaml as they'd never be created or merged

* allow alternate vault prefix to be passed into `genesis new`

* extract/refactor slug-ifying vault prefix from env name

* allow params.vault to be resolvable by params processing, keep params.vault_prefix for backwards compatibility

* Ensure genesis secrets was given a target environment file

* use consistant naming for vault prefix

starkandwayne/genesis,starkandwayne/genesis,starkandwayne/genesis