JIRA: https://jira.spring.io/browse/INTEXT-113 Previously `router` could be configured only as last component in the `IntegrationFlow` definition. * Remove `defaultOutputChannel` options from `AbstractRouterSpec` * Populate `outputChannel` to the `AbstractMessageRouter.defaultOutputChannel`, when there is more EIP-methods after `.route()` * Rename EIP-method `.recipientListRoute()` to the `.routeToRecipients()` * Make compatibility with SI 4.1 * Tested against SF 4.1
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