Workaround latest boot snapshot issue
XD-2423 Defer WireTap Until Tap Channel Bound

JIRA: https://jira.spring.io/browse/XD-2423

Previously, the `WireTap` was added to the module `output` channel
before the channel was bound to the bus,

There is a race condition where the main stream can start sending
to the tap before it is bound to the bus,  causing 'Dispatcher has no subscribers`
errors. In 1.0.x this would prevent the message from being sent to the
main stream. In 1.1.x, taps run on a different thread so it's just log
noise.

Defer adding the `WireTap` to the tapped module's `output` channel
until it has been bound to the bus as a pub/sub producer.
Fix Test Timing Issue

Caused Travis failure.
XD-2422 Fixed version numbers for NPM/Bower dependencies

* Upgrade UI dependencies for NPM and Bower
XD-2332 Provide Server-Side Cron Expression Validation

* Add validation REST endpoint
* Add AngularJS directive to perform async validation
XD-2332 Code Review Changes

* Add integration tests for ValidationController
* Rename `CronValidationDto` to `CronValidation`
* Move `CronValidation` to REST domain module
XD-2332 Code Review Changes
XD-2332 Code Review Changes

* Improving Async Validation